Answer:
A glass of warm milk usually does it.
You could take some diphenhydramine (Benadryl) to get you a little sleepy. It's non-habit forming and isn't exactly a "sleeping pill" per se.
Make sure that your environment is right for sleep. It should be a comfortable temperature, free of noisy distractions. Sometimes, even the ticking of a clock can keep you from achieving sleep. Clear your mind; just concentrate on slow, deep breathing.
To find out more about sleep, or get bored to sleep in the process, you can check out this article:
http://en.wikipedia.org/wiki/sleep...
try reading it will make you sleepy it does me lay in bed and just start reading
good luck
watch an old black white movie
get into to bed and try to sleep...
drink some wine and then go into bed
workout/shower and then go to bed...