Melatonin is not a sleeping pill for inducing sleep, but a "chronobiotic" that serves solely to signal to the biological clock when the night begins.

noli's read

This advice is scientifically robust and reflects the current consensus in chronobiology. Endogenous melatonin is indeed a circadian signaling hormone rather than a potent sedative, a point supported by numerous systematic reviews and meta-analyses (e.g., Journal of Clinical Sleep Medicine). The idea that it serves to shift the circadian rhythm (phase advance or delay) is widely demonstrated by randomized controlled trials (RCTs). Where confusion often arises is in public consumption: many supplements offer dosages well above natural levels, which can create a mild sedative effect but is not the primary physiological mechanism. Walker highlights a crucial nuance here that is often ignored: melatonin helps to 'set' the clock rather than 'knock out' the user. There is no exaggeration here, but rather a necessary clarification in the face of the misuse of this substance as a miracle pill against insomnia.

the sources

No named source held this one up — that absence is part of the verdict.