I sometimes use melatonine in a pretty large dosis, 5mg, but time released. In my subjective experience it helps me sleep deeper, and have more vivid or even lucid dreams. I don't do it very often, only when I feel my mind has been on overdrive for too long a time (and then I sometimes I even take two time-released pills approx 2 hours apart from each other). I also sometimes take a lesser dossage (about 1mg) without going to sleep but just to relax the mind (sort of like a good haze (weed)). I am not gonna dig up reports but I believe there has been done quite a bit of research on the effects of melatonine (perhaps in combination with taurine, glycine and GABA) to ease the minds of those that 'suffer' from information processing anomalities (like add and the likes). On the other hand, melatonine is also produced by your body when you eat a good chunk of cheese.

peace,

-k