For years I woke up in the middle of the night, every night, and couldn't get back to sleep for hours. I tried many different things, but what actually worked for me was the Apollo blue light:
http://www.amazon.com/gp/product/B000G2 ... d_i=507846. It helps to reset your circadian rhythm. It's similar to the light boxes that have been used for Seasonal Affective Disorder for years, but this one is much smaller. There's an assessment you can take online to give you an idea of a circadian rhythm issue is contributing to sleep problems:
http://www.talkaboutsleep.com/circadian ... y-page.htm. I used it for several months, but after about 2 weeks, my sleep pattern normalized. I haven't had to use it since, so loaned it to a friend who had chronic insomnia. His sleep has now normalized, too. This sounds like an advertisement - sorry! - but it's what actually did work for me.