My point was that I think the study is generalizing too much.

Sleep deprivation does not make "everyone" violent or even irritable. Individuals react in individual ways.

Sleep deprivation does tend to shut down the executive (or judgement or rational) areas of the brain that act as an inhibitor of impulsive behaviors.

So without sufficient sleep (or with sufficient alcohol) people lose their usual, rational, sensible inhibitions and their more irrational, hidden sides come out. Shy people might become comedians or make bold sexual advances, and the quiet guy who seems timid might erupt in a violent rage.

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