On work days I always get a good 7-8 hours, but if I'm not working I very rarely manage more than 3-4, it's as if my brain feels like it's wasting the day. I'm one of those people who can operate comfortably on very little sleep. I use a sleep cycle alarm that is supposed to wake me when it senses I'm only sleeping lightly or something, no idea if any of that stuff's real/helpful but it can't hurt. I also maintain a healthy weight (I used to be overweight) which keeps pressure off my neck and reduces snoring & breathing interruptions, that definitely helps with feeling rested.

Once in a blue moon my body decides to sleep about 9 hours longer than planned to catch up on missed sleep, but I either rarely feel particularly tired or I've been doing this long enough that I don't remember what being properly awake felt like 🤷‍♂️