insomnia
"I have been on prescription Ambien for over a year now. Last month, I decided to take a more natural approach to sleep. It was nerve wrecking at first, and I had terrible insomnia. Then I started taking melatonin. The first night I got a full 8 hours. As long as I keep a sleep schedule, this stuff is amazing. 
Note: take half your dose in the afternoon and half an hour before bed. Sleep at the same time each night."