Yes, sleep apnea can contribute to insomnia, and the two often happen together. Repeated breathing pauses can wake you through the night, and some of those wakes become long stretches lying awake. Researchers call the combination COMISA: comorbid insomnia and sleep apnea. If you snore loudly, gasp awake or are very sleepy in the day, get checked for apnea before starting sleep restriction.
How apnea and insomnia feed each other
Obstructive sleep apnea means the airway narrows or closes again and again during sleep. Each time, the brain briefly rouses you to start breathing again. Usually you do not remember these arousals. But they fragment sleep, and some of them become full wakes.
That is where insomnia can join in. Wake often enough and you start to notice, check the clock, and worry. Over weeks, the bed can become a place you associate with being awake, and the worry about sleep takes on a life of its own. Now there are two problems: the breathing and the insomnia.
It works the other way too. Insomnia can make apnea treatment harder: people who struggle to fall asleep often find it harder to get used to wearing a CPAP mask. That is part of why treating both matters.
Signs that point toward apnea
| More typical of insomnia | More typical of sleep apnea | |
|---|---|---|
| At night | Lying awake, mind busy, watching the clock | Loud snoring, gasping or choking awake, pauses someone else notices |
| In the morning | Tired and frustrated | Headache, dry mouth, feeling unrefreshed even after a long night |
| In the day | Tired and wired; hard to nap even when you try | Sleepy; dozing off reading, watching TV or as a passenger |
| Main worry | Whether you will sleep tonight | Often none; many people do not know they have it |
A sleep tracker or phone app that says you snore, or shows a low oxygen reading, is not a diagnosis either way. It is still a reasonable thing to mention to your doctor, alongside what a bed partner has noticed.
These overlap, and you can have both columns at once. Other things that raise the chance of apnea include high blood pressure, a larger neck, being overweight, and menopause, though people of any size can have it.
Why apnea is easy to miss in someone with insomnia
Sleep apnea has a stereotype: an older, heavier man who snores like a train and nods off at his desk. Plenty of people with apnea look nothing like that. Women, younger adults and slimmer people get it too, and they are more likely to describe their sleep as insomnia: trouble staying asleep, waking often, never feeling rested.
People with insomnia also tend to report feeling tired rather than sleepy. That can hide the daytime sleepiness that usually raises the flag for apnea. And if you sleep alone, nobody is there to hear the snoring or notice the pauses. So if your insomnia comes with frequent waking for no clear reason, unrefreshing sleep, or any of the signs above, it is reasonable to ask about apnea even if you do not fit the picture.