You sleep in a private, hotel-like room wired with painless sensors - scalp electrodes, chest belts, a finger clip - while the lab records brain waves, breathing, oxygen, and movement.
MedlinePlus notes you arrive about two hours before bedtime, wiring takes about an hour, and most people sleep enough for a valid study even when they feel they slept badly. Sensors unclip fast for bathroom trips; results follow in days to a couple of weeks. If apnea shows mid-study, some labs split the night: the second half on a CPAP to find your pressure.
What to do
Common questions
What is a sleep study like?
An overnight polysomnography is easier than it sounds: you arrive at the sleep center about two hours before your normal bedtime, per MedlinePlus, get settled in a private, hotel-like room, and a technologist attaches painless sensors - small electrodes on the scalp and face for brain waves, belts around the chest and abdomen for breathing effort, a finger clip for oxygen, leg sensors for movement, and a nasal airflow sensor. The wiring takes about an hour; after that you watch TV or read and sleep as normally as the sensors allow - most people sleep enough for a valid study even though they feel they slept badly, which the lab expects. A camera and microphone let the tech monitor and help if you need the bathroom - the sensors unclip fast. In the morning they remove everything and you go home; results follow in days to a couple of weeks. If apnea is found mid-study, some labs run a split night: the second half with a CPAP mask to find your pressure. For straightforward apnea screening, ask whether a home study works instead - simpler sensors, your own bed. Pymander, a free AI doctor available 24/7 by text, can help you prepare.