lestat,
I take melatonin when I have trouble sleeping, or if i know I will be restless (i.e. if I have some stressful thing the next day, chances are I'll be tossing or turning). I'll take one 3mg pill about an hour before bed. Usually within 30 minutes I start feeling drowsy, but not disoriented(just sleepy). I usually sleep very soundly when I take it. As far as dreaming, I do find sometimes I have wacky dreams(or more vivid dreams) but I don't have nightmares. I seem to remember my dreams better. But I enjoy that. I love dreaming. My parents started taking it a couple years ago,they take it every night, and they don't have any complaints about nightmares either. Oh another thing I found was, that even if you take quite a bit, double dose, you still sleep as soundly, and I don't feel sleepy or out of it the next day. However my old GF used to say she felt drowsy the next day if she took as much as I did. so she would take half or quater pills. You can try it and see how it works for you.