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MINI REVIEW article

Front. Neurol., 09 January 2023
Sec. Sleep Disorders
This article is part of the Research Topic Sleep Disorders and Airway Diseases View all 16 articles

Sleep disturbance in post COVID-19 conditions: Prevalence and quality of life

\nRimawati TedjasukmanaRimawati Tedjasukmana1Astri Budikayanti,
Astri Budikayanti2,3*Wardah Rahmatul Islamiyah,Wardah Rahmatul Islamiyah4,5Anastasia Melissa Ayu Larasati Witjaksono,Anastasia Melissa Ayu Larasati Witjaksono2,3Manfaluthy Hakim,Manfaluthy Hakim2,3
  • 1Faculty of Medicine, Universitas Kristen Krida Wacana, Jakarta, Indonesia
  • 2Department of Neurology, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
  • 3Department of Neurology, Cipto Mangunkusumo General Hospital, Jakarta, Indonesia
  • 4Department of Neurology, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
  • 5Department of Neurology, Dr. Soetomo General Hospital, Surabaya, Indonesia

Post COVID-19 conditions are complaints and symptoms in patients with a history of probable or confirmed COVID-19 after 3 months of the onset of COVID-19 and last at least 2 months. About 10–20% of people may experience post COVID-19 conditions, one of which is sleep disturbance. There is a wide range of prevalence of sleep disturbances from 6% to more than 70%. An online survey of the post COVID-19 conditions in various countries showed that 78.58% of subjects had sleep disturbances, including insomnia, sleep-disordered breathing, central disorders of hypersomnolence, circadian rhythm sleep-wake disorders, parasomnias, and sleep-related movement disorders. Sleep disturbance can be found starting from 2 weeks until 48 weeks or more after discharge or after having a negative COVID-19 test results. Women aged < 50 years old with severe COVID-19 infection reported a worse outcome. Several mechanisms may cause sleep disturbance in post COVID-19 condition, namely persistent viral infection and inflammation, immunity dysregulation, and mitochondrial dysfunction. Several studies discovered sleep disturbance was a major problem that affected different domains of QoL in post COVID-19 conditions. Significant correlation was found between several dimensions of SF-36 with moderate-to-severe insomnia in post COVID-19 conditions. Therefore, sleep disturbance is a major problem in post COVID-19 conditions and may affect patients' QoL, and the existence of sleep disturbance should be a concern in post COVID-19 conditions period. Further research is required to determine the prevalence based on agreed definition as well as methods to assess this condition and its impact on QoL.

1. Introduction

Some patients who have suffered from Coronavirus Disease 2019 (COVID-19) may experience prolonged complaints and symptoms known as post COVID-19 conditions. Post COVID-19 conditions is a term of complaints and symptoms that have just appeared or continued after 3 months since the clinical onset of COVID-19 and have lasted for at least 2 months, or a history of close and confirmed contact (1, 2) World Health Organization (WHO) data shows the prevalence of post COVID-19 conditions estimated at 10–20%, with sleep disturbances among the six most complained of disorders in this condition (1). There is a wide range of prevalence of sleep disorders among different countries. Furthermore, there was a study conducted online with respondents from several countries found that 78.6% of patients with post COVID-19 conditions experienced sleep disturbance (2).

The biological process of sleep is crucial for preserving internal balance and overall well-being. In post COVID-19 conditions, several mechanisms, including persistent viral infection, persistent inflammation, involvement of the autoimmune system, and mitochondrial dysfunction can interfere with the part of the brain that regulates the sleep-wake cycle, causing sleep disturbance (3). On top of that, if sleep disturbance is not adequately managed, it can interfere with immune system and will further affect the sleep-wake cycle, which will continue creating a vicious circle and decrease overall QoL.

During the post COVID-19 condition period, sleep disturbance have a significant negative impact on variety of QoL aspects (4). A study conducted by Sigfrid et al. showed that patients with post COVID-19 conditions have a significant 10% decrease in QoL (5). According to Davis et al., 45.2% of the patients with post COVID-19 conditions needed to work fewer hours than they did before getting sick, and a further 22.3% were off work at the time of the survey because of the sickness (2). The Short Form-36 (SF-36)'s several dimensions of QoL had a statistically significant positive association with Insomnia Severity Index (ISI) scale. In addition, Global Pittsburgh Sleep Quality Index (Global PSQI) and mean duration of post COVID-19 conditions also showed a statistically significant positive correlation with various domains of the SF-36 QoL scale (4).

Understanding QoL is crucial for enhancing patient care, symptom alleviation, and rehabilitation. Patients' self-reported QoL issues may prompt therapy and care revisions and improvements, or may demonstrate that some therapies are ineffective. Identifying the variety of issues that may affect patients also involves using QoL (6). Therefore, in this review, we discuss the currently available published literature related to sleep disturbance in post COVID-19 conditions, the prevalence, the possible mechanism, and its association with QoL.

2. The post COVID-19 conditions definition

Since the global outbreak of novel coronavirus pneumonia in 2019, known as Coronavirus Disease (COVID-19), the knowledge about the long-term effects of the disease has rapidly grown. There are several definitions and terms for long-term symptomatic COVID-19. This condition was described for the first time by Greenhalgh et al. as post-acute COVID-19 and chronic COVID-19, with post-acute COVID-19 lasting more than 3 weeks after the start of the first symptoms and chronic COVID-19 lasting more than 12 weeks (7). According to the Scottish Intercollegiate Guidelines Network, the Royal College of General Practitioners, and the National Institute for Health and Care Excellence (NICE), long COVID is defined as signs and symptoms that developed during or after a disease that is consistent with COVID-19 and that persist for more than 4 weeks but cannot be accounted for by other diagnoses (8). Therefore, WHO stated that post COVID-19 conditions are complaints and symptoms that occur in patients with a history of probable or confirmed COVID-19 after 3 months of the onset of infection and last at least 2 months (1). These complaints and symptoms of the post COVID-19 conditions cannot be explained by other alternative diagnoses, and have an impact on the patient's daily functioning. Symptoms may persist after infection or appear after a period of recovery. Symptoms can also fluctuate (change in quality and quantity over time) or recur (recurrence of disease manifestations after symptom improvement) (1, 2).

Multiple organs may be affected by the post COVID-19 conditions (2). According to WHO, the most common symptoms and complaints were fatigue (78%), shortness of breath (78%), and cognitive dysfunction (74%). In addition, other symptoms that are often complained of are memory disturbances (65%), muscle pain or spasms (64%), and sleep disturbances (62%) (1, 2). A significant increase of psychological manifestation such as anxiety and depression was noticeably reported in post COVID-19 conditions (9, 10). Noticeably, a meta-analysis study found fatigue, cognitive dysfunction, and sleep disturbance appeared to be the key features of post COVID-19 conditions (1, 9).

3. Discussion

3.1. Prevalence and types of sleep disturbance in post COVID-19 conditions

Globally, more than 160 million cases of COVID-19 have been confirmed and there have been more than 3 million deaths. The majority of COVID-19 patients have mild to moderate symptoms, whereas 14% of patients have severe symptoms and 5% are in serious condition (11). The median time to recover from COVID-19 is 13 days, with an interquartile range of 9–17 days (12). Despite already having negative PCR test result, 1 in 5 people may have symptoms for 5 weeks or more, while 1 in 10 may be symptomatic for 12 weeks or more (13). In a study conducted by Whitaker et al., 37.7% of 76,155 people with post COVID-19 conditions experienced at least one persistent symptom, while 17.47% experienced three or more symptoms, lasting up to 12 weeks (14). This study also examined the prevalence of post COVID-19 conditions after a period of 12 weeks, they found 5.80% patients with one or more symptoms and 2.23% of patients with three or more symptoms (14). The prevalence of persistent symptoms was higher in women than in men and the risk of post COVID-19 conditions symptoms increased linearly with age (14, 15).

Sleep disturbance were among post COVID-19 conditions that were frequently recorded throughout the pandemic, both during the acute phase of COVID-19 and after recovery, which resulted in ongoing problems for the survivors' lives (16). Rousseau et al. conducted a follow-up study of subjects with severe COVID-19 who were hospitalized for more than 7 days and found that 75% had poor sleep quality. They suggested that the majority of severe COVID-19 survivors have sleep fragmentation and frequent arousals from sleep (17). Davis et al. conducted an online survey of the post COVID-19 conditions phenomenon in various countries. The study results showed that 78.58% of subjects had sleep disturbances (2). Another study conducted by Sigfrid et al. in the UK found that 46.2% of patients experienced sleep disturbances 3 months after initial COVID-19 symptom onset (5).

Studies in North-Africa and the Middle-East have found similar results. 35% of post COVID-19 conditions patients were still displaying sleep disturbance 2 months after discharge from a Bangladesh hospital, primarily in patients with diabetes mellitus (16). A cross-sectional observational study in the Saudi Arabia investigated the sleep disturbances in 32% patient and showed high scores of ISI and PSQI (4). According to a study conducted in Egypt with 85 recovered COVID-19 patients and 85 individuals without COVID-19, most recovered COVID-19 patients (77%) showed sleep disturbance, compared to 46% of controls (18).

Despite the fact that patients with post COVID-19 conditions frequently complain about sleep, but comprehensive data are still lacking. Data from several studies showed that the prevalence of sleep disturbance in post COVID-19 conditions has a wide range between 6% to more than 70% (Table 1). This wide range can be due to differences in methodology used in previous prevalence studies. Some studies included all patients with post COVID-19 conditions, while others only included patients who had sleep disturbances during the acute infection period and were observed throughout their recovery time. Most of the studies in Table 1 mention the types of sleep disturbance experienced by patients in the form of insomnia, while only two studies focused on Obstructive Sleep Apnea (OSA). There was only one study described several types of sleep disturbance and their prevalence, with insomnia at 60%, waking up several times at night at 41%, awakening due to breathing difficulty at 36%, having restless legs syndrome (RLS) at 18%, sleep apnea at 10%, having vivid dreams at 33%, nightmares 26%, and lucid dreams 15% (2). Another cause for this wide range of prevalence might be due to the variations in evaluation time following the onset of COVID-19 in the studies shown in Table 1, starting from 2 weeks until 48 weeks or more after discharge or after having a negative COVID-19 test results (19, 27).

TABLE 1
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Table 1. Type and prevalence of sleep disturbance.

3.2. The possible mechanism of sleep disturbance in post COVID-19 conditions

Although no specific pathophysiological theory can define post COVID-19 conditions, attention has been directed toward several mechanisms, including persistent viral infection, persistent inflammation, involvement of the autoimmune system, and mitochondrial dysfunction (3). One of the mechanisms, namely persistent viral infection indicated by persisting SARS-CoV-2 RNA for up to 230 days after the onset of symptoms in several anatomic areas, including the brain's various regions (38). Since the virus also affects the hypothalamus and brainstem, it may disrupt the sleep-wake cycle, resulting in insomnia or poor quality of sleep (39).

Persistent proinflammatory cells [IL-1, IL-6, and Tumor Necrosis Factor-α (TNF-α)] and altered cytokine production is suspected to have occurred during persistent inflammation in post COVID-19 conditions, revealed by a cytokine profiling study (40, 41). Inflammation can modify sleep by increasing Non-Rapid Eye Movement (NREM) sleep and decreasing rapid eye movement (REM) sleep, and vice versa sleep disturbance can also modify the inflammation process by altering circulating cytokines (41, 42).

There are evidence pointing that post COVID-19 conditions involves autoimmunity (43). Dysregulation of this autoimmune response may cause sleep dysfunction. Both humoral and cellular immune-mediated response can target sleep-regulating neural structures (e.g., brainstem, hypothalamus) as well as neurotransmitter systems (e.g., hypocretin) (40, 44).

Mitochondrial dysfunction in post COVID-19 conditions was reported in a small cohort that discovered lower fatty acid oxidation and elevated lactate levels early in workout, showing that mitochondrial dysfunction was present and metabolic reprogramming had occurred (45). Damaged mitochondria can release a wide range of damage-associated molecular patterns that are potent activators of the inflammatory response (46). This process can damage the neurons in the sleep-regulating area of the brain, which affects the circadian rhythm, sleep apnea, and obstructive sleep apnea (47, 48). Figure 1 summarized all possible pathogenic mechanisms of sleep disturbance in post COVID-19 conditions.

FIGURE 1
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Figure 1. Possible pathogenic mechanisms of sleep disturbance in post COVID-19 conditions.

3.3. Factors contributing to sleep disturbance in post COVID-19 conditions

Several factors may contribute to sleep disturbances in post COVID-19 conditions. Disease severity, circadian rhythm disturbance, psychiatric disturbance, uncontrolled chronic diseases during acute stage, social isolation, social economic status, age and even gender may play a role. When individuals with moderately severe symptoms are treated in hospitals, hospitalization might alter the circadian rhythm, which may lead patients to have sleep disturbances. Circadian rhythms, which are primarily triggered by daylight, meals, and exercise (49) are frequently compromised or altered while a patient is hospitalized (50). COVID-19 patients tend to experience fear and anxiety about social isolation procedures, as well as mandatory lockdowns in the acute phase, leading to an increased incidence of sleep disturbances in the population (5153). A study reported a higher prevalence of difficulty falling asleep, staying asleep, and getting up early in patients with moderately severe COVID-19 infection, whereas difficulty staying asleep and waking up earlier was experienced in patients with more severe disease (54). Another study showing that diabetes mellitus was independently associated with sleep disturbances among patients with post COVID-19 conditions showed that the presence of chronic illnesses can also have an impact on the persistence of sleep disturbance (16). COVID-19 patients conveyed that the disturbing factors that affect them are a sense of tightness, worries about illness, anxiety, the voices of other patients, medical staff, and medical devices (50). Another study using actigraphy found that patients with severe COVID-19 symptoms, including those with severe respiratory symptoms and those requiring Intensive Care Unit (ICU) displayed lower sleep efficiency, higher immobility time, and higher fragmentation index compared to those with mild symptoms and who do not require ICU care (55). Actigraphy may not be the gold standard for evaluating sleep, but it is simple to implement and could be sufficient for identifying changes in sleep schedules that would indicate disturbances of the circadian clock (56).

There is a bidirectional relationship between sleep disturbance and psychiatric disorders (57). A study described that patients with post COVID-19 condition who listed mental health issues such as stress, anxiety, or depression were more likely to develop sleep disturbance compared to those who did not (21). Another study reported that moderate to severe sleep disturbances associated with mood symptoms evaluated using the Patient Health Questionnaire (PHQ)-2 and the Anxiety Disorder (GAD)-2 questionnaires (58). It is critical that healthcare professionals evaluate and treat sleep disturbance among patients with post COVID-19 conditions in order to improve both their regular sleep patterns and mental health because adequate sleep is essential for facilitating patient recovery (21).

A study evaluated insomnia in post COVID-19 conditions reported that age and health status may be the influencing factors. Insomnia is more common in older individuals because they tend to experience a low self-evaluation and are more prone to be under multiple strains, including social economy and health-related problem (19). Among patients with post COVID-19 conditions, another study reported that women also predicted poor result of global PSQI (18). According to a study, women are more likely than men to survive severe acute illness, which may lead to worse long-term results. However, more investigation is required to demonstrate why women predominately experience the post COVID-19 conditions (5).

3.4. Quality of life of sleep disturbance in post COVID-19 conditions

The Quality of Life (QoL) was defined as “a patient's general subjective perception of the burden of sickness or medical condition on various areas, including physical, psychological, social, and occupational functioning” (6). The QoL of patients with post COVID-19 conditions has been significantly affected regardless of the period of time after discharge or recovery. A study conducted by Sigfrid et al. reported that patients with post COVID-19 conditions showed a significant 10% decrease in QoL (5). This measurement is based on 5 dimensions, consisting of mobility, self-care, activities of daily living, pain or discomfort, and anxiety/depression (5, 59). The most frequently discussed risk factors for poor QoL included female sex, advanced age, co-morbidities, Intensive Care Unit (ICU) admission, prolonged ICU stay, and mechanical ventilation (60).

There was still a significant persisting impact on QoL across all dimensions in patients with post COVID-19 conditions 12 weeks after onset in both survivors and family members (61). During the period of post COVID-19 conditions, sleep issues must be handled because they have severe effects on numerous areas of QoL. The SF-36's several dimensions of QoL had a statistically significant positive association with moderate-to-severe insomnia based on ISI scale. One third of total patient had moderate-to-severe insomnia showed significant positive association with several dimensions of SF-36, such as physical functioning, role limitation due to physical health, role limitation due to emotional problems, and general health. Global PSQI score of post COVID-19 conditions also showed a statistically significant positive correlation with various domains of the SF-36 QoL scale (4). Another study also indicated that poor sleepers based on PSQI examination significantly underperformed in several SF-36 areas relating to subjective physical and mental health indicators when compared to good ones (29).

There was a high proportion of patients with post COVID-19 conditions who also suffered from mental health issues such as stress, anxiety, and depression (21). A study using Short Form-8 (SF-8) to measure QoL found that post-Traumatic Stress Disorder (PTSD) has mediating effect on insomnia and QoL (62). Since sleep disturbances and mental health are strongly associated, intervention and prevention strategies concerning mental health issues may improve Health-Related Quality of Life (HRQoL) and sleep in patients with post COVID-19 conditions (62).

Regardless of the amount of time after discharge or recuperation, the QoL of the patients with post COVID-19 conditions was significantly impacted (60). Understanding QoL is crucial for enhancing patient care, symptom alleviation, and rehabilitation. Patients' self-reported QoL issues may prompt therapy and care revisions and improvements, or they may demonstrate that some therapies are ineffective (6). Therefore, it is important to take further preventive steps in order to stop the sleep disturbance in patients with post COVID-19 conditions from worsening and affecting QoL.

4. Conclusion

Sleep disturbances have a strong impact in decreasing post COVID-19 conditions' overall QoL. Various kinds of sleep disturbance can be found in patients with post COVID-19 conditions with a wide range of prevalence, between 6% to more than 70%. This wide range may be caused by differences in methodology and timing of assessments following the onset of COVID-19. No specific pathophysiological theory can define the post COVID-19 conditions or sleep disturbance in post COVID-19 conditions. Still, several mechanisms that play a role in post COVID-19 conditions can cause sleep disturbance, namely persistent viral infection, persistent inflammation, autoimmunity or immunity dysregulation, and mitochondrial dysfunction. In addition, other factors such as disease severity, circadian rhythm disturbance, psychiatric disturbance, uncontrolled chronic diseases during acute stage, social isolation, social economic status, age, and even gender may also play a role. Sleep disturbance positively correlates with several dimensions SF-36, a measurement tool for QoL. By better understanding the impact of sleep disturbance on QoL, the existence of sleep disturbance should be a concern in post COVID-19 conditions period. Besides, it is important to take further preventive steps in order to stop the sleep disturbance in post COVID-19 conditions from worsening and affecting QoL. Further research is required to determine the natural history of this condition as well as to define risk factors, pathogenesis, the prevalence in various countries, and therefore determine possible interventional strategies.

Author contributions

All authors participating in conceptual framework, study design, literature review, and drafting the manuscript for publication.

Funding

The authors would like to thank Universitas Indonesia for funding this research through the PUTI Grant (Contract Number: NKB-1109/UN2.RST/HKP.05.00/2022).

Acknowledgments

The authors convey their appreciation to Faradillah Mutiani MD and Nadhira Iriani Djatmiko MD for their assistance during the manuscript writing.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher's note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: post COVID-19 condition, COVID-19, sleep disturbance, prevalence, quality of life

Citation: Tedjasukmana R, Budikayanti A, Islamiyah WR, Witjaksono AMAL and Hakim M (2023) Sleep disturbance in post COVID-19 conditions: Prevalence and quality of life. Front. Neurol. 13:1095606. doi: 10.3389/fneur.2022.1095606

Received: 11 November 2022; Accepted: 02 December 2022;
Published: 09 January 2023.

Edited by:

Sy Duong-Quy, Lam Dong Medical College, Vietnam

Reviewed by:

Vu Tran Thien Quan, University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam
Vinh Nhu Nguyen, University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam

Copyright © 2023 Tedjasukmana, Budikayanti, Islamiyah, Witjaksono and Hakim. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Astri Budikayanti, yes astri.budikayanti@ui.ac.id

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.