saccy, ferget sleeping pills. work on your preparation instead.

have dinner an hour earlier
after dinner, forget the TV: do the race visualisation that's keeping you up at night.
have a shower to relax
when you go to bed, try to recall all the posts from the aussie thread: brain numbingly effective
load a tape of big brother up late into the vcr as a backup plan: that crapola will put anyone to sleep.

and ease up on the caffeine during the arvo/evening