If I'm REALLY wired, and can't sleep I take a 1 mg dose of melatonin. (mackenziehoran.com)
This is four times the 1 mg dose found in most prenatal vitamins. (babycenter.com)
Participants who took the largest 10 - mg dose showed less decline on one of two memory tests than those receiving lower doses, or the placebo. (sciencemag.org)