I went through this pase for 4 months where I had an extremely hard time falling asleep , and when I would sleep it was only for four hours or so . Just went from 7 hours to 4 one day . I went to a sleep Dr . , and he didn ' t really have any good advice . I even went to a psychologist for a couple months . One day I took melatonin and I slept well for the first time in months . I still don ' t know if it really fixed the issue or of it really was psychological . It has been working for two years though . The thing I thought was odd was that the sleep Dr . told me to take the melatonin 67 hrs before bedtime . I tried that the first day and absolutely crashed about an hour after I took it . I now take it about 4560 mins before bed . I honestly have never fallen asleep faster in my life than in the past two years .