I've not seen any hard proof on this yet, but I strongly believe it to be true. I have taken something to sleep with every night since I was 18. I am now 47. The time release works better at keeping me asleep throught the night. My doctor recommended melatonin since he would not prescribe long term sleep medications.
Dreams are much more vivid both in color and content.
The content of the dreams seems to be more sexual in nature. I almost never have or have had nightmares. I am really impressed the mel. I wake up a little slower and use light to help. My mind seems clearer and I'm less hung over than with using prescription medicines.