You wear the mask all night, do everything right, and still jolt awake gasping or choking, the same startling sensation you may have had before you ever started CPAP. It’s discouraging and a little alarming, since the whole point of the machine is to stop that from happening. You might also notice you’re still snoring loudly, waking up as tired as before treatment, or your bed partner tells you they still hear you struggling to breathe at night.

Why this happens

Waking up gasping despite CPAP usually means your airway is still collapsing, which points to the pressure not being high enough to keep it open. This can happen for a few different reasons. Your original prescribed pressure may genuinely be too low if your weight, alcohol intake, sleep position, or nasal congestion has changed since your titration. Mask leak can also be a hidden factor working in the opposite direction you’d expect, a chronic leak can distort what the device reports and, depending on the machine and mode, sometimes mask real events from being detected or corrected. And on rare occasions, the events causing the gasping are central rather than obstructive, meaning the brain briefly stops signaling you to breathe, which pressure changes alone don’t fully resolve.

Steps to troubleshoot

1. Check your machine’s residual AHI data with your provider, since a number consistently above 5 events per hour signals your current pressure isn’t adequately controlling the underlying breathing events
2. Review your leak data at the same time, since high leak nights can distort both your true pressure delivery and how reliably the device is even detecting events that night
3. Don’t try to manually increase your own pressure setting, since going too high without proper reassessment can introduce new problems like aerophagia or treatment-emergent central events
4. Ask whether a repeat titration study makes sense, especially if it’s been a while since your last one or your weight, alcohol habits, or nasal breathing have changed
5. Mention any snoring, gasping, or choking your bed partner has noticed, since that outside observation is often more reliable than what you remember yourself
6. If gasping continues despite an adequate pressure and low leak, ask your sleep doctor whether the events look central rather than obstructive, since that changes the treatment approach

Who to talk to

Your respiratory therapist can pull your leak and residual event data and flag anything that stands out before your next doctor visit. Your DME can help troubleshoot equipment issues that might be corrupting your data, like a worn cushion or improper mask fit. Your sleep doctor is the one who should actually adjust your prescribed pressure or order a repeat titration, since undertreated sleep apnea has real health consequences and this isn’t something to guess at on your own.

Evidence

Research using overnight device data has found that residual respiratory events remain common even in patients using CPAP consistently, and that automated detection can under-report the true number of events, particularly when a high central apnea index is present at baseline.¹ Separately, research on air leak has shown that a large leak can corrupt the flow signal CPAP devices use to detect breathing events, meaning a night with heavy leak can show a falsely reassuring low event count even though real obstructive events are still occurring and simply going uncounted.² This is part of why waking up gasping deserves a direct conversation with your provider rather than assuming the reported numbers on your app tell the whole story.

References

1. Reiter J, Zleik B, Bazalakova M, Mehta P, Thomas RJ. Residual events during use of CPAP: prevalence, predictors, and detection accuracy. J Clin Sleep Med. 2016;12(8):1153-1158.
2. Martinot JB, Hostaux L, Malhotra A, Hwang D, Pépin JL. Air leak phenotyping by mandibular jaw movement analysis in CPAP therapy: key insights for practitioners. Respirol Case Rep. 2024;12(10):e70030.