It's so frustrating when you go to bed and simply can't sleep. Personally, I don't need really calm music to sleep; calm enough is good, sometimes with a bit of rhythm just to give my brain that pace it needs to switch to stand by mode :D
This mix works perfectly if you're just trying to relax for a while too. Hope you like it! Twenty-one tracks including music by The Smashing Pumpkins, Air and Radiohead.