I fall asleep slowly. Takes a while usually.
Depends how tired I am. But things that help are reading before bed (when I was in college my chemistry textbook was a help!) or doing a xword puzzle. Listening to music works when my head won't shut up.

When really desperate I start doing dumb shat in my head like naming animals that start with each letter of the alphabet or counting down from 1000. I can't say how successful these were, I think they just killed time until I did fall asleeep.

Sometimes just lying there and changing positions (side to stomach) helps. If you just don't want to sleep, sometimes forcing yourself to go thru your nightly ritual and getting into bed can help even tho u don't feel tired.
My pdoc won't give me anything for sleep and I honestly probably Wouldnt take it anyway.

An unhealthy method that always worked in college was excessive drinking. They say passed out alcohol induced sleep is not quality sleep but I swear I would feel great the next morning from sleep with my brain shut off. Wouldn't recommend this though, as it could lead to insomnia not being ur only problem.

Best of luck sleeping.