Sleep and ME/CFS
In ME/CFS, sleep often doesn’t restore energy, no matter how long you sleep. New research from Griffith University (2026) found that the brain’s overnight waste-clearance system is impaired in ME/CFS, and linked this to worse sleep and more brain fog. See The science.
That makes it all the more important to find and treat any sleep problem that can be fixed.
Sleep apnoea: the hidden overlap
Sleep apnoea is common in people diagnosed with ME/CFS. Its symptoms overlap heavily (unrefreshing sleep, daytime exhaustion, brain fog, lightheadedness), so it can hide behind an ME/CFS diagnosis for years. Most ME/CFS diagnostic criteria say it should be ruled out, but that step is often skipped.
It’s treatable with a CPAP machine or a mouth splint, which makes it one of the few things that reliably helps when it’s present.
What is it?
During sleep, breathing repeatedly stops or becomes shallow, usually because the throat muscles relax and the airway partly collapses (obstructive sleep apnoea). Each pause briefly rouses the brain, sometimes dozens of times an hour, without fully waking you. The result is fragmented sleep and repeated dips in oxygen.
Signs to look for
- Snoring, gasping or choking at night (a partner often notices first)
- Waking with a dry mouth, sore throat or headache
- Feeling unrefreshed however long you sleep
- Getting up to the toilet often at night
- In women: often insomnia, fatigue and low mood rather than loud snoring, which is why it’s frequently missed
Does it run in families?
Partly. Roughly 30–40% of the risk is genetic, through jaw and throat shape, where the body stores fat, and how the brain controls breathing during sleep. A parent or sibling with sleep apnoea roughly doubles your risk, and a grandparent counts too. Tell your GP about any family history. It strengthens the case for a referral.
Before your appointment
Watch your sleep for a few nights, or ask someone to watch for snoring, pauses or gasps. A sleep sound-recording app or an overnight pulse oximeter isn’t diagnostic, but it gives you something concrete to show your GP.
Sleep studies
What a home study measures
- Airflow, via a small tube under the nose
- Breathing effort, via chest and belly belts. This shows whether pauses come from a blocked airway (obstructive) or the brain not sending the signal (central).
- Blood oxygen, via a finger clip
- Heart rate, body position and snoring
- Fuller studies add brain waves (EEG), eye and chin sensors to show sleep stages, arousals and leg movements
Understanding the results
| Measure | What it means |
|---|---|
| AHI (apnoea-hypopnoea index) | Breathing events per hour. Under 5 is normal; 5–15 mild; 15–30 moderate; over 30 severe |
| Oxygen desaturation index | How often and how far your oxygen drops, and the lowest level reached |
| Sleep architecture (EEG studies) | Time in deep and REM sleep, sleep efficiency, how often you were roused |
In Australia
- Your GP runs screening questionnaires (such as OSA50, STOP-Bang or the Epworth Sleepiness Scale).
- If your score is high enough, you can get a Medicare-rebated home study.
- If not, a private study costs roughly $300–400 out of pocket. Younger people who don’t fit the “typical” sleep apnoea profile may need to go private.
General sleep tips for ME/CFS
- Keep a regular wake time, even after a bad night
- Rest during the day in a way that doesn’t wreck night sleep, e.g. lying down with your eyes closed rather than a long nap late in the day
- Dark, cool, quiet room. Eye masks and earplugs help with sensory sensitivity.
- Avoid screens and stimulating conversations in the hour before bed
- Some supplements and medications (e.g. NADH, LDN) can affect sleep. See Supplements and Medications.
- Talk to your GP about sleep medications if insomnia is severe