Do you suffer from recurring nightmares? If you do, I highly recommend you read this. It has worked for me and it may work for you too. Sleep can be hard enough to get: being fearful of repeating a nightmare makes it harder.
Here are some other sleep tips from the New York Times that I thought were useful.
The Times also has advice on how to deal with waking up in the middle of the night and being unable to get back to sleep, here.
Do you exercise hard? If so, listen to Atlantic CEO Nicholas Thompson who argues that among the things you need to be successful athlete is good sleep.
Sleepwell is an initiative to help people sleep better without medication. You can check it out, here.