The most important thing about sleep I learned is to fall asleep at the same moment of every day. Make it 22:00 or 23:00 or 00:00. Whatever is comfortable for you. But you have to stick to the chosen hour as hard as you can. Every day from now on it has to be that hour. After you get used to that you will notice a much better effect of the sleep.
I believe that routine in general helps a ton. Go to sleep at the same time, eat at the same time, go for a walk at the same time, etc. You will wake up at the same time as a side effect. At least that's what happened to me during covid, when there were no obligations outside of working hours. During normal times, I will stay up late one or two days a week for social events or have to get up early for travel. That messes with your rhythm, almost like being jet lagged.
Strongly disagree and you should refrain from trying to give universal advice on these matters. I never had a 24h circadian rhythm. The only way to fall asleep at the same moment every day for me would be to medicate myself. I am very happy and productive when I am allowed to "rotate around the clock" and the worst periods of my life were when I was forced to be on a strict schedule.
The most important thing with any health issue is to be aware of your own body.
I agree with how important this is, but for me, the most significant improvement in my sleep has been pushing my dinner very early, ~6 hrs before bed, and having it be my smallest meal of the day. I usually feel quite hungry about an hour before bed but if I get over that hump my resting heart rate is much lower at night and my appetite the next day is much lower. It was validating to see Bryan Johnson sharing the same findings on x.