Written by the Nuvirox Research Team
Key Points
- A meta-analysis of 29 studies and 13,935 long COVID patients found a pooled sleep disturbance prevalence of 46%.
- The same analysis found insomnia specifically affected about 38% of patients, with poor sleep quality at 56%.
- Some research found sleep disorder prevalence increasing the longer out from infection people were, from 24% at 3-6 months to 30% past 12 months.
Short answer: sleep disturbance is one of the most common and persistent long COVID symptoms, affecting roughly half of patients according to pooled data — and for some people it appears to get more common over time, not less.
How common is insomnia after long COVID, based on actual data rather than anecdote?
A systematic review and meta-analysis published in the Journal of Infection pooled data from 29 studies covering 13,935 long COVID patients. It found an overall pooled prevalence of sleep disturbance of 46%, with poor sleep quality specifically at 56% and diagnosable insomnia at 38%. Excessive daytime sleepiness was found in about 14% of patients. A cross-sectional analysis of 200 patients at the Stanford Long COVID Clinic found 87% reported at least one sleep complaint — unrefreshing sleep, insomnia, or lethargy — through a general intake screening question, notably higher than many previously reported figures, though the researchers noted this may reflect how the question was asked rather than a true higher prevalence.
Does this get better over time, or does it stick around?
The evidence here is genuinely mixed, which is worth stating honestly. Data cited in one analysis found an upward trend in the prevalence of sleep disorders over time following infection — approximately 24% of patients affected 3 to 6 months post-infection, 29% at 6 to 9 months, and 30% more than 12 months after infection, according to one meta-analysis of 63 studies. But the same review notes that other individual studies have observed the opposite pattern, with symptoms improving over time instead. A Japanese retrospective study specifically found sleep disturbance prevalence was roughly double in patients infected during the Omicron-dominant phase (24.8%) compared with the earlier Delta phase (12.8%), suggesting the specific viral variant may also matter.
What's actually driving it?
This overlaps with the broader pattern described in why you can't sleep when you're sick or congested, though long COVID's sleep effects appear to persist well beyond acute illness. A prospective cohort study looking at long COVID patients with chronic insomnia found that social isolation, stress, anxiety, persistent inflammatory response, and corticosteroid use might all contribute, alongside possible dysfunctional habits like excessive caffeine consumption or poor sleep hygiene that could develop during a prolonged illness. A separate Japanese study found long COVID patients with sleep disturbance had significantly higher levels of plasma adrenocorticotropin (a stress-hormone-axis marker) and lower serum growth hormone than those without sleep disturbance, suggesting an underlying hypothalamic-pituitary stress response may be involved, not just psychological factors.
When to See a Doctor
If sleep disturbance is part of a broader constellation of long COVID symptoms — including breathing changes, chest pain, significant cognitive impairment, or symptoms that are worsening rather than improving — please see a doctor familiar with long COVID care. Long COVID clinics increasingly screen for sleep using structured questionnaires, and treating sleep specifically has been suggested as a way to potentially help other symptoms like fatigue and brain fog.
What's the honest limitation in this research?
Reported prevalence varies enormously across studies — from 24% to over 78% in different samples, according to the Stanford-affiliated review — which the researchers attribute partly to inconsistent definitions and measurement tools across studies, and partly to real differences in patient populations and how far out from infection people were surveyed. Much of the literature also relies on self-report rather than objective sleep measures like actigraphy or polysomnography, and there isn't yet a large, well-controlled study directly comparing which specific interventions best address long-COVID-related insomnia.
Is snoring or sleep apnea part of this picture too, or is it just insomnia?
It's broader than insomnia alone in at least one large cohort. The Researching COVID to Enhance Recovery (RECOVER-Adult) study, a prospective observational cohort, reported sleep disturbances in 32% of long COVID cases overall — but within that figure, snoring or sleep apnea specifically was present in 38% of cases, and was identified as one of the 11 most distinguishing symptoms separating people with long COVID from those without it in that dataset. That's a useful detail because it suggests long COVID sleep evaluation shouldn't stop at asking about difficulty falling or staying asleep; breathing-related sleep symptoms appear to be a distinct and fairly prominent part of the overall picture, which is one more reason a sleep-literate long COVID clinic, rather than general assumption, is the right venue for sorting out what's actually happening.
Frequently asked questions
Is my insomnia after COVID actually related to the virus, or just coincidence?
Given that pooled data across nearly 14,000 patients finds sleep disturbance in roughly half, and several studies find biological markers like elevated stress-hormone levels specifically in long COVID patients with sleep problems, a genuine connection is well supported, though it can't be confirmed for any single individual without ruling out other causes.
Will long COVID insomnia go away on its own?
The evidence is mixed — some data shows sleep disorder prevalence increasing the further out people are from infection, while other individual studies show improvement over time, so there's no single confirmed trajectory.
Does treating the sleep problem help other long COVID symptoms?
This hasn't been established with dedicated randomized trials, though several researchers have suggested it as a plausible and worthwhile avenue, given how closely sleep, fatigue, and cognitive symptoms tend to move together. If you're also waking up multiple times a night, tracking the pattern can help your doctor distinguish long-COVID-related insomnia from other causes.
Does the specific COVID variant I had matter for whether I get sleep problems?
There's some preliminary evidence it might — a Japanese retrospective study found sleep disturbance prevalence was roughly double in patients infected during the Omicron-dominant period compared with the earlier Delta period, though this is a single study and hasn't been replicated widely enough to be considered settled.
From Nuvirox
Why we formulated Sleep+ Restore
Sleep+ Restore pairs 10 mg of melatonin with a 905 mg blend of calming botanicals and amino acids — L-tryptophan, L-theanine, chamomile, passionflower, ashwagandha, GABA, and 5-HTP among others — studied individually for supporting relaxation and sleep onset. It is backed by a 60-day money-back guarantee, long enough to actually evaluate it the way sleep research suggests you should.
If you're taking corticosteroids or other medications as part of long COVID management, check with your doctor before adding a new sleep supplement.
The bottom line
Insomnia is one of the most consistently documented symptoms of long COVID, affecting close to half of patients in pooled data, with plausible biological contributors beyond simple stress or anxiety. Whether it improves or worsens over time appears to vary by study and possibly by viral variant, which is an honest gap in the current evidence rather than a settled answer.
References
- Prevalence of sleep disturbances in patients with long COVID assessed by standardised questionnaires and diagnostic criteria: A systematic review and meta-analysis. J Infect. 2023. ScienceDirect S0022399923003926.
- A Multidimensional Assessment of Sleep Disorders in Long COVID Using the Alliance Sleep Questionnaire. PMC12563213.
- Characteristics of Sleep Disturbance in Patients with Long COVID: A Retrospective Observational Study in Japan. PMC9783729.
- Central hypersomnia and chronic insomnia: expanding the spectrum of sleep disorders in long COVID syndrome. BMC Neurol. 2022.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.