CPAP is a machine that forces continuous air through your nose via a mask. When you have sleep apnea, you're actually not breathing, thus, wake up during the night. The CPAP machine keeps the air moving, thus, you don't wake up.

I have _mild_ sleep apnea (you go through tests for diagnosis). With a CPAP machine, I've been able to add a solid hour per night of sleep, from about 6.5 hours to 7 .5-8, with it being continuous. Ergo, I don't make the "midnight trip to pee" with it on. With it off, I snore loudly, and wake up at least 1-2 times during the night.

It's possible that Ajay here actually has worse apnea, and the "9-10" hours from before was actually spent waking up, then trying to get back to sleep. Thus, the "6 hours" is just purely continuous sleep, instead of hours of tossing and turning.

Sleep apnea tests are comfortable take home tests. You basically just wear a couple of sensors for a night. If you're not prone to apnea, don't bother with a CPAP. It's not cheap, and some people can't get used to putting the mask on.