A sound (or sounds) that cause an increased amount of exhaustion.
“Damn bro! Your voice is making me sleepy. Take that melatone somewhere else!”
by LighterFaery68 February 10, 2019
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(adj.) describes the effect of something that increases the levels of melatonin in your body.

Examples of things that are melatonic: darkness, injury, melatonin pills, cannabis
*after smoking a bowl*
"We should go to sleep soon"
"Yeah man, I'm just gonna wait for the melatonic effects to kick in"
by shit_im_tired September 29, 2011
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(adj.) Melatonin-like, causes sleep to happen

(muh-LA-toe-nis)
"Why did you fall asleep in the middle of my story?"
"I'm sorry Linda, but I find your voice to be melatonous."
by Jason Gudasz February 21, 2021
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