For me melatonin increases the intensity of my dreams. In fact, it is too much for me. Even just taking the smallest dose available commercially. I dream vividly every night without any drugs in me. I just recently started smoking pot again after about 15 yrs of abstinence. I started doing this so I won't have nightmares. Now I only have nightmares 1-2xweek instead of 1-2 times per night! Some mornings when I wake up I feel like I expended more energy during sleep than I did when I was awake.