Top Definition
This is a superhero who's super power is the power to stay awake all night. This superhero does not even see his super power as a strength, he just wants to be able to sleep all night like normal people.
Me: "Hey Nocturnalman, how was your night last night? Did you stay up all night fighting crime?"

Nocturnalman: "I was up all night again, I just want to sleep."
by kaelli June 17, 2010

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