

I'm going to avoid innuendo and give a serious reply.
The Mrs and I swear by camomile tea. I see a few other herbal suggestions above and either could work, it really depends on the person.
Camomile tea is proven to ease anxiety and relax you. We often swig a cup right before bed and find ourselves slipping into natural and lengthy sleep everytime. I urge you to try this for a week or so.
I didn't get on with 5HTP.
Get yourself down your local rough boozer, they'll sell all kinds of pharmaceuticals down there.
On second thoughts don't.
I spent last Sunday night checking on a guys breathing every 15 minutes as he'd taken a cocktail of crack and a shed load of heroin. Our resident doctor said as long as his respiration rate didn't go below 8 breaths per min, he'd be fine.