Sleep Apnea Symptoms: Warning Signs You Should Not Ignore
Sleep apnea affects an estimated 30 million Americans — and 80% don't know they have it. The symptoms can be subtle, easy to dismiss, or mistaken for other conditions. Understanding what to look for is the first step toward diagnosis and treatment.
Reviewed by Thomas D'Acquisto, Sleep Health Director
Last updated June 2025
Common Symptoms of Sleep Apnea
Obstructive sleep apnea (OSA) occurs when the muscles in your throat relax during sleep and temporarily block your airway. Each time this happens — called an apnea event — your brain briefly wakes you to restore breathing. These micro-arousals can happen dozens or even hundreds of times per night, and most people have no memory of them.
The result is fragmented, non-restorative sleep that affects every aspect of your health and daily life. The symptoms fall into two categories: what happens at night (often noticed by your partner) and what happens during the day (what you feel).
Nighttime Symptoms
Many nighttime symptoms of sleep apnea happen while you are asleep, so you may not be aware of them. Your bed partner is often the first person to notice something is wrong.
Loud, chronic snoring
The most recognizable symptom of OSA. Snoring is caused by air forcing its way through a narrowed airway, creating vibrations in the soft tissue of the throat. OSA-related snoring is typically loud enough to be heard through closed doors and often worsens when sleeping on your back.
Gasping or choking during sleep
When your airway fully closes, breathing stops until your brain triggers a brief arousal to reopen it. This often manifests as a sudden gasp, snort, or choking sound. If your partner tells you that you stop breathing during sleep, this is one of the strongest indicators of OSA.
Restless sleep and frequent awakenings
Repeated micro-arousals prevent you from staying in deep, restorative sleep stages. You may toss and turn, kick, or wake up multiple times without knowing why. Many people attribute this to insomnia or stress.
Frequent nighttime urination (nocturia)
Waking up two or more times per night to urinate is a lesser-known but common symptom of OSA. The repeated drops in oxygen trigger changes in heart pressure and hormone levels that increase urine production. Treating OSA often resolves nocturia.
Night sweats
The effort of breathing against a blocked airway and the stress response from oxygen drops can cause excessive sweating during sleep. If you wake up with damp sheets but your room is not hot, OSA may be the cause.
Daytime Symptoms
Because sleep apnea prevents restful sleep, its effects carry over into every waking hour. These daytime symptoms are what most patients notice first — even if they have no idea that disrupted breathing at night is the root cause.
Excessive daytime sleepiness
Feeling exhausted despite sleeping 7-8 hours is the hallmark daytime symptom of OSA. You may struggle to stay awake during meetings, while driving, or while watching TV. This is not normal tiredness — it is the result of your sleep being interrupted hundreds of times without your knowledge.
Morning headaches
Waking up with a dull, pressing headache — typically across the forehead — is reported by roughly 50% of OSA patients. These headaches are caused by oxygen deprivation and carbon dioxide buildup during sleep. They usually improve within an hour of waking.
Difficulty concentrating and brain fog
Sleep fragmentation impairs the brain's ability to consolidate memories and maintain focus. You may find it harder to concentrate at work, forget things more easily, or feel mentally sluggish throughout the day.
Irritability and mood changes
Chronic sleep deprivation affects emotional regulation. People with untreated OSA are more likely to experience irritability, anxiety, and depression. Partners and coworkers may notice personality changes before the patient does.
Dry mouth or sore throat upon waking
When your airway narrows, you are more likely to breathe through your mouth during sleep. This causes dry mouth, sore throat, and sometimes a hoarse voice in the morning.
Symptoms Your Partner Notices
Bed partners are often the first to recognize sleep apnea. If your partner has mentioned any of the following, take it seriously — these observations are among the most reliable indicators of OSA.
Important: If your partner has witnessed you stop breathing during sleep, this is a strong indicator of obstructive sleep apnea and warrants a sleep study.
When to See a Doctor
You should be evaluated for sleep apnea if you experience two or more of the following:
How Sleep Apnea Is Diagnosed
The only definitive way to diagnose sleep apnea is with a sleep study. There are two types:
Home Sleep Test (HST)
A portable device you wear at home for one or two nights. It measures breathing, oxygen levels, heart rate, and body position. Ideal for most patients suspected of having OSA. Results are interpreted by a board-certified sleep physician.
In-Lab Polysomnography (PSG)
An overnight study conducted in a sleep lab. Measures additional data including brain waves and leg movements. Recommended when other sleep disorders are suspected or if the home sleep test is inconclusive.
Both tests measure the Apnea-Hypopnea Index (AHI) — the number of times breathing stops or slows per hour. An AHI of 5-14 is mild, 15-29 is moderate, and 30 or higher is severe sleep apnea.
Next Steps
If you recognize these symptoms in yourself, don't wait. Sleep apnea does not go away on its own, and the health consequences of leaving it untreated get worse over time. The good news is that treatment is highly effective, and most patients feel dramatically better within days of starting therapy.
Start with our free 2-minute sleep assessment to understand your risk level, or learn about the treatment options available to you — including comfortable CPAP alternatives that 90% of patients prefer.