To be honest, I just started that post to see what other people think.
Personally, the only way I’ve been able to relax and get some sleep recently is to concentrate on one thing at a time. There are so many things going on that I have so little control over that I feel myself going insane every time I try to think about them. So, quite frankly, I distract myself by putting all my effort into one thing at a time. I study for my biology course, check my e-mail, play a game, watch a TV show, read my Bible… but I never try to think about something else when I doing one certain thing.
Now, there IS a time and place to just sit down and think about this issues that are bothering you. The point is that you need to MAKE TIME to think about them. If you continually put off thinking about these things, you will find you mind constantly wandering to them at inconvenient times, like at work, during a test, or when you’re trying to get some sleep. So, set aside a little time during the day to sit/lay down and just think.
Personally, I also find a lot of wisdom in the Biblical books of Psalms or Proverbs. You can read them at http://www.biblegateway.com/ if you don’t have a Bible. Or, if you really want to go to sleep, read Leviticus. ;-)
Good luck, and good night!