To add to this. If you can’t sleep after about 15-20 minutes get out of bed and do something to relax your brain. Reading or meditating works well. Definitely no phone or TV, don’t read anything captivating. Read something boring you aren’t into. After you feel ‘sleep pressure’ go back to bed.

Over time this helps your body associate the bed with just sleeping. But it takes time and dedication. Find a routine.

Also highly recommend always going to bed and getting up at the same time, even weekends.