Any ideas for better sleeping?


I've been struggling with my sleep because I stay around 2 or 3 hours before I fall asleep with a combo of melatonine doxylamine and bromazepam.
I've been sleeping well because I wake up when I need but next week I need to take a routine again because of my exams. I feel super tired and sleepy when I go to bed but I cant fall asleep and If I don't take any pill like today, I fall asleep really late and wake up before and also during. I have sleep today like 4.5 hours or less.

What may I do? I do sport, move my body, don't stay at bed and don't use my phone before sleeping...