My husband first learned of melatonin years ago. It all started when he took a three week job at the power plant. His job schedule was 6:30 pm to 4:30 am trying to get some sleep after this was just about impossible for him. On his fourth day there, even though he had his hard hat on his head he hit a steel beam then fell backwards giving him a mild concussion. The melatonin along with his pain pills would at least give him seven hours of sleep.