Still Tired on CPAP? Common Reasons and What to Ask Your Doctor

First, check how much you use it

The most common reason is not enough hours. CPAP only works while it is on. If you wear it for 4 hours and sleep for 7, apneas can return for the remaining time, often during REM sleep in the early morning. Review your data honestly.

Is your therapy actually working?

• Leak: high leak can weaken therapy and fragment sleep.
• Residual AHI: if it is consistently above 5, or rising, share it with your clinician.
• Mask discomfort, dryness or aerophagia may be waking you up even if you do not remember it.
• Pressure may need review, for example after weight change.

Are you getting enough sleep?

Most adults need 7 or more hours of sleep a night. CPAP cannot make up for too little sleep. Shift work, a late bedtime, caffeine, alcohol and screens can all cut into sleep.

Other conditions to consider

Ongoing sleepiness can come from many things besides sleep apnea:

• Other sleep disorders such as insomnia, restless legs syndrome, periodic limb movements, narcolepsy or circadian rhythm disorders.
• Central sleep apnea, including a form that can emerge during CPAP treatment.
• Depression and anxiety.
• Medical issues such as thyroid problems, anaemia, heart or lung disease.
• Medicines that cause drowsiness.

Your clinician may recommend a repeat sleep study or other tests.

Medicines for residual sleepiness

For people with obstructive sleep apnea who still have excessive daytime sleepiness despite effective, regular CPAP use, there are FDA-approved wake-promoting medicines, such as solriamfetol, modafinil and armodafinil. They do not treat the apnea itself and are not a substitute for CPAP. Whether they are suitable is a decision for your clinician.

Safety first

If you are drowsy while driving or operating machinery, do not drive until you have spoken to your doctor. Drowsy driving is dangerous and is a key reason sleep apnea treatment matters.