There's a million reasons for insomnia. I used to do the waking-up-in-the-middle-of-the-night-my-mind-racing routine, but that usually meant I had an unresolved issue; when I faced it, I could go to sleep. In the old days, I also had problems sleeping after smoking dope; don't know why.
Have you changed your bedclothes, or has the temperature in your bedroom changed? It's difficult to sleep when you're too cold, and yet you often don't _realize_ you're too cold. These days, my sleeping problems are mainly temperature related; if I can't sleep, I click on the heater or throw an extra blanket on the bed; usually works.
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