Top Definition
Also know as SII. Self Inflicted Insomnia is a basic lack of sleep caused by your own boredom and lack of interest in sleep. People with Self Inflicted Insomnia could sleep if they so desired, but they don't care to, so they stay up as long as possible, sometimes for days.

A person with SII doesn't necessarily need a reason to stay up. Usually people with this disorder spend their time on the internet, even if there is nothing to do. They'd rather stare at a wall than close their eyes.
Person 1: I never see you log off, do you ever sleep?
Person 2: No, I have Self Inflicted Insomnia.

Person 1: So you can't sleep? That sucks.
Person 2: I just don't want to, plus my cat is making cute faces at me.
by iproxii June 24, 2011

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