You need to wind down after your shift. At one point I had a 3rd shift job, 10pm-7am. Then another time I had a 7a-4p job, school from 5p-9p, then a remote working thing from 10p-3a. If you don't find some way to chill out and relax and get your mind working slowly, you're fucked.
Set alarms. Live by them. If the alarm says you go to bed at 10am, then fucking do it. Also try changing your diet to give your body enough time to get everything digested, if you're still digesting, you won't sleep well or easily. Minimum of 90 minutes between eating and sleep. Do you do anything else other than sleep in your bedroom? The only things that should be done in your bedroom should be sex and sleep. Keep the rooms separate, and your mind will understand that once you enter that room, it's either sleep or sex -- if you're me a combination, lol.
If you'd like to talk further about it (the work/sleep, not the sex), hit me up on fb or aim.