Also turn off electronics (or at least stop using them) an hour before you go to bed. Have a shower. Read a book. Make your bedroom cool, dark and calm. I play sleep music but that's not for everyone.
Our body temperature drops while we are asleep so studies have suggested we can 'trick' ourselves into sleeping by having a cool shower before bed or sleeping in a cool room.
Finally, invest in a good night sleep. While this isn't possible for everyone, a decent mattress, soft sheets, and personalised pillows help with a good night sleep. Go to a bedding store and test out the different pillows that are available. Price doesn't necessarily reflect quality but cheaply made pillows will lose their shape faster.