@incoff
Did you ever have nightmares prior to supplementing melatonin? Have you tried Magnesium?
I suppose you follow the normal pre-sleep protocols. No TV, phone, computer, darken house, relax for an hour or two before bed, go out in the sun everyday, sleep in cool room, go to bed everyday at the same time and get up at the same time, no large or spicy meals close to bedtime, no caffeine, etc, although my Mom had coffee right before bed and was asleep within 5 minutes. 10 minutes on a bad night and I stayed up all night or up to a week on rare occasions.
Hoping your sleep improves,
Jake