I have tried two different brands of melatonin now and have had very different experiences with them. The one I take is also the same one that my doctor takes.
I take 5mg every night of the Source Naturals sublinguals and wake up feeling very rested. I remember my dreams, but only vaguely. The ingredients on this one say: Vitamin B-6 (as pyridoxal-5 phosphate) 335mcg, Melatonin 2.5 mg, sorbitol, mannitol, natural orange flavor (
), magnesium stearate, and stearic acid. Contains: soy.
However, I recently took some of my old brand (Puritan's Pride) melatonin and woke up for two days feeling dehydrated and with pressure on my forehead. I also could not remember my dreams and I felt like I had "slept like a brick." This version was in tablet form and my doctor recommends sublinguals, because they're much better, in her opinion. The ingredients on this one say: Melatonin (as n-Acetyl-5-Methodxytryptamine), dextrose, cellulose (plant origin), vegetable magnesium sterate, silca, croscarmellose.
This leads me to think that getting the right brand of melatonin can make all the difference in its effectiveness. I figure that some people might not like orange flavor, lol, or soy, but I just wanted to post my discoveries, for what they're worth.