To echo what a ton of people have probably already stated...melatonin. 3mg instant release works perfect for me.
Are there any side effects to Melatonin?
Kava Kava works and you're not too drowsy in the morning but you are still a little bit.
Something that's been working really well for me lately is Magnesium, powder, not pills. ( Pure Essence Labs - Ionic-Fizz Magnesium Plus - Raspberry Lemonade - 342 gm)
It's a natural muscle relaxer so it helps with all sorts of things like relaxing to sleep, chronic pain (due to muscular tension), charlie horses, migranes and IBS.
Are there any side effects to Melatonin?
I've got some melatonin that I never use. Gonna take some tonight just to see if I have some cool dreams.