I've got this wrist band that every time I wear whilst I'm drunk I get injured at some point during the night... it's really weird, one time I fell down a flight of stairs and got concussion, then woke up in hospital... bloody wrist band.
A joint does the trick for me haha but if you're not a 420 type of person try some of that 'Sleepy Time' tea... not sure if it's placebo or what but it seems to work for me.