rleathe, my vote is that you’re addicted to a good night’s sleep. Brain chemistry and chemicals change as we grow older. Endocrinologically, our body starts to down-regulate (i.e., the body makes less of what we need) as we grow older. Supplementing with melatonin just brings things back to normal levels. Normal levels in this case mean you fall asleep the way you’re supposed to.
Sleep assistance properties aside, melatonin is an awesome supplement. It’s a great antioxidant and unlike most of the antioxidants, it can cross the blood-brain barrier. Breast cancer patients take it at EXTREMELY high doses, up to 50g/day. It regulates the circadian rhythm and helps with jet lag. Don’t worry about becoming addicted. We take vitamins preventatively to keep from suffering a deficiency. Supplementing with melatonin helps with brain chemical deficiencies.