I have sleep apnea. It’s never been officially diagnosed, but my wife knows all about it and tells me so. At one point, I dealt with this problem by tying a tennis ball into the rear of a sleeveless t-shirt. This makes it very uncomfortable to sleep on my back, which is the only time the apnea is a problem. I usually end up on my back as I roll around at night.
Lately I have been waking up dead tired every day, even if I get a lot of sleep. I need to either buy some new t-shirts and revive the tennis ball trick, or go have a sleep study and get myself a CPAP machine. The one that my wife used to use is in the closet, and she hates it. I hear they have gotten a lot better in recent years, looking less like a fighter pilot mask and interfering less with your movement.
I do hear that losing a lot of weight can get rid of the problem. This is something I’d like to do, but it isn’t really a short-term solution.