insomnia
"My first taste of Lunesta was as part of a study to see if "sleep enhancements" lowered blood glucose levels.  I don't know about that BUT, I immediately found that my former energy level was back and with that my high spirits as well.  It was as though I had, for years, been sleep-walking through life and have been throughly awakened.  My problem was not insomnia, rather poor quality of sleep.  Like another commenter, my dreams are back and not just the ones that I have while I'm sleeping!"