Top Definition
The act of staying up till all hours of the morning diddling around on the computer and waking up at some unreasonable hour with your keyboard stuck to your forehead.
Karen: Dan, what's up with your neck today?
Dan: I was up all night on the computer doing research. Have they found a cure for cybersomnia yet?
Karen: You're an asshole!
by amisstree October 06, 2009

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