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Your brain should produce it. But if it's not dark in your sleeping room or you lack tryptophane, levels are low and supplementing might help. https://en.wikipedia.org/wiki/Melatonin
good luck!

I died. RIP!! Turns out I'm allergic to beds.

I got a few pills. I shall try them I guess.

Good luck! You should stop dying all the time, must be strenous.