reading a book in bed usually works for me.
or lay on a couch with the tv down low so you can't really hear what's going on and drift off to sleep.

I hate it like that though man, when your eyes are so active and don't want to close but your dead tired. Ughh I seem to get that more and more if I'm not high when I go to sleep, so I dunno what's up with that.

good luck though