Aha!! You... "go to bed, I read until I am tired...". No. Never. The bed should be for two things only. Regarding sleep, set your sleeptime and stay out of the bed until then. Don't even lay on the couch while wacthing TV. Sit up straight or stand. Set your waking time as well. Maintain these times - every day, weekends too.

As for all those thoughts about what didn't get done today and what has to get done tomorrow, tell yourself today is over and the best thing you can do now for tomorrow is sleep... it is time to sleep... you are really going to enjoy the wonderful, relaxing, deep sleep.

Lay flat on your back, completely relax your entire body, breath slowly and deeply. Enjoy the relaxation. If you don't sleep on your back, don't worry about it. You will roll to your normal position when it's time.

Do the same thing in the middle of the night. Lots of good advice above re temperature, caffine, etc.