Melatonin

[Angrboda]

You haven't taken enough melatonin to know what it does and does not do.

Neither have you, apparently.

The available pharmacologic doses of fast-release melatonin (eg, 3 mg) and low-dose slow-release (or controlled) preparations (eg, 0.5 mg) tend to increase hormone levels over a 24-hour period, thus altering the circadian pattern of
circulating melatonin. Abnormally high melatonin levels at night and in the day after consumption of a pharmacologic dose of the hormone may disrupt the delicate mechanism of the circadian system and dissociate mutually
dependent circadian body rhythms, which is described in a recent study. Thus, if administered in high doses or at inappropriate times, melatonin may induce a circadian rhythm disorder rather than cure one.

(source)