I'll try it out and see if it works for me

Reddit:

When you’re in bed with your eyes closed, roll them back as far as you can (it’s kind of a weird feeling to me). Hold them like that for several seconds, relax, repeat. The reason something so simple works is because your eyes roll back naturally when you’re really asleep in this fashion. Doing it deliberately signals the brain to release melatonin, which is one of our “sleep hormones” (and popular as a supplement to take at bedtime to help sleep). So there you have it. I just saved you 12 bucks. :D