Noise machine.

http://mynoise.net/

Wanted to share a site I found that has helped me recently, it's basically filled with different sound machines that can help you relax.

For example, there's a airplane cabin sound machine, it sounds realistic and relaxes me, as well as grey noise.

Along with those noises, there's brain wave sound machines; Binaural and Isochronic.

Personally Isochronic has helped me relax a lot, if you close your eyes and focus on the sound it should work.

These probably won't work for everyone, but it's worth a try. There's even sounds like a campfire, rain, etc.