I tend to tire myself out as much as possible before lying down - in this way I can just fall asleep instead of lying doing nothing or worse, letting my brain make noise. It often means going to bed quite late, though I am working on a routine atm. Going to sleep early is just counterproductive. If I lie down at 10 pm instead of midnight, for example, I typically won't sleep until at least 1 am.
But even if I go to sleep early, I don't sleep well. Also, I won't fall asleep if there are any disturbing sounds around - or at least I won't sleep well. For example, last night I woke up once because I was thirsty, once because I had an annoying dream, once because I was too hot, once because of a dog barking and twice or so because the wind made shutters hit the window and make noise. I can also be easily woken up by any kind of snoring, shuffling, closing of doors or steps, so I just tend to sleep with earplugs or earphones in.
I used to think that I need more sleep than others but what I realised after getting some sleep analysis hardware was that I have on average at most half an hour of deep sleep per night, doesn't matter how long I sleep. An average healthy human should have between 1-2 hours of deep sleep per night. I'm working on building it up by tracking the amount of sleep in comparison to the things I try out. For example, I get on average 20 minutes of deep sleep if I have earplugs, 10 min more if I don't eat at least three hours before bed and get my deep sleep severely cut off if I drink any kind of caffeine less than 7 hours before sleep.
I once got 1,5 hrs deep sleep and felt really refreshed despite sleeping an hour less than normal. Can't say how it happened though, I can only guess that it was because of moved sleeping hours - I got the most deep sleep between 4 am and 5 am (24 min), as well as 8 am and 10 am (47 min), with some scattered single minutes in other parts of the night. Normally I wake up at 6 or 7 am for work, but that was my day off.
I dream very rarely too and I used to track any dreams I had, so I can guess that it's difficult for me to fully finish the 90 min cycle.
Proper sleep is very important to me. If I don't sleep well, I feel dysregulated.