For me the problem is not falling asleep, its waking up at O dark 30 wide awake.
5:30 am here, wifes not up for another hour, so here I am surfing the boards.
I would agree with Lynx though, watch out for the traps.
Part of it is learning to slow then shut the mind down. Mediation, self hypnosis, can hep some.
Having enough exercise to feel truly tired at the end of the day can help.