If its just an isolated night, roll with it, and dont nap the next day so you'll be good and tired. If not and insomnia becomes the norm instead of the exception deal with what is keeping you up as others have noted. Sleep hygiene is also worth looking into , a set of good habits to get into and helped me some. And when all else fails melatonin, and if that doesn't work, benadryl and when all else fails see a doc and get a script. I've been there and it is a miserable state to be in . See alttaced for sleep hygiene tips.