Try shutting down your electronics about an hour or so before you plan on going to bed. Pick up a good book and read it. You can also try sleepytime or chamomile tea to help you sleep, melatonin is known to help with sleep also. No caffeine!!
How to get a good night's sleep?
Drink warm milk at bedtime, don't drink any caffeine past 2:00 p.m.
There are many factors associated with sleeping such as maintain a daily routine, sleeping on a good mattress, keep room temperature comfortable, take a little exercise before bed, use perfume etc.