I've had trouble for years with insomnia. I'm bipolar, but no matter how well my medications seem to work, I simply can't sleep and spend all night over thinking. Often the sun comes up and I finally fall asleep- only for my alarm to go off! Melatonin is simply amazing. I take it about an hour before I'm ready to go to bed, and sleep through the entire night. I don't even wake up halfway through the night and have trouble falling back asleep anymore!