Over Analyzing

I'm not sure if it's a result of my type A personality, but I tend to over analyze.  Especially when things don't go the way I think they should.  I wonder if I could have changed things.  If I caused the issue.  Whatever the case, it's left me a bit sleep deprived lately.  I'm finding it hard to fall asleep and then when some strange noise wakes me up in the middle of the night I start thinking about it again, thus making it hard to fall back asleep.

Do any of you find yourself in similar situations?  If so, what have you found that helps you stop analyzing and get on with life?