[who_would_fardels_bear]

Too much melatonin, or even a little for some people, can lead to hallucinations, or dreams that are so vivid they appear as hallucinations.

So melatonin is not the cure for everyone.

[LibertarianLiz]

Too much melatonin, or even a little for some people, can lead to hallucinations

As someone who has had problems with sleeping for a very long time; I can assure you that not sleeping (my top non-sleeping was 3 days) can also give you hallucinations (why is there a hand coming out of my wall?).