Snoring & Apnea
What actually happens in a sleep study
"Sleep study" sounds clinical and scary. In reality it's painless — you're mostly just... sleeping, while sensors record what your body does.
The two main types
- In-lab polysomnography (PSG). You spend a night at a sleep lab. Soft sensors on your scalp, face, chest, and finger track brain waves, breathing, oxygen, heart rate, and movement. Nothing is inserted; nothing hurts. A technician monitors from another room.
- Home sleep test (HST). A simplified kit you wear in your own bed — usually a finger sensor, a nasal cannula, and a chest band. Convenient and cheaper, best for screening straightforward sleep apnea.
What they're looking for
Mainly how often your breathing pauses or shallows (the AHI — apnea-hypopnea index), how far your oxygen drops, and how fragmented your sleep is. The results tell a doctor whether you have sleep apnea and how severe it is — which decides the treatment.
Good to know: yes, people really do sleep with the sensors on. You don't need a "perfect" night — even partial sleep gives doctors enough to work with.
Wondering if you need one?
Take the self-assessment →This article is general sleep education, not a diagnosis or personalised medical advice. If sleep problems persist or worry you, please consult a licensed physician.