Has anyone tried taking a megadose of melatonin? This quote from Wikipedia piqued my curiosity:
"Extremely high doses of melatonin (50 mg) dramatically increased REM sleep time and dream activity in both people with and without narcolepsy."
(http://en.wikipedia.org/wiki/Melatonin)
The quote is cited from the book "Melatonin and the Biological Clock" by Alan Lewis (1999). There's no way of knowing how the melatonin was administered without talking to the author but I'm assuming it was orally. Oral melatonin is only 35-50% bioavailable so if the author did perform the experiment intravenously, much more melatonin would be needed to be taken orally.
I'm thinking about taking 10 5 mg pills one night when I have at least 12 hours to kill, just in case it knocks me out. For now I just break a 5 mg pill into quarters and take one quarter when I don't feel tired (2 nights a week on average).