I'm having similar problems with not sleeping. Now that the days are getting longer make sure your curtains are well lined and tightly closed as the light induces wakefullness, not good at 4am! Also keep pets out of the bedroom, especially cats, If I wake up and then manage to drop off again it is gaurenteed that the cat will decide to come and snuggle up to me (or bite my toes, it depends how she feels). Ovelteine is good, but there are two camps reguarding hot milk/ alcohol, it sends you to sleep but can also cause you to wake up after a few hours due to the metabolic proscesses.

If all else fails spread your sleeplessness around and wake everyone else up!