Top Definition
The phenomenon of staying up ridiculously late at night on the computer, either:

a) playing WoW
b) participating in an online RP
c) watching porn.

A portmanteau of "schizophasia" and "noctis" (Latin for "night".) If a hapless internet-goer turns the general thrill of Noctophasia into a habit, it holds the general properties of substance addiction.
Scott: How come Kim didn't wake up until four this afternoon, man?
John: Oh, she's got Noctophasia.
Scott: Poor kid.

John: Yeah, I'm trying to get her into rehab.
by Monteil4 June 26, 2010

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