Prehypna Intoxication

A state of cognitive impairment most akin to alcoholic intoxication, caused by sleep deprivation (mild to severe), wherein the inflicted will behave in a manner one would associate with being drunk, hence the colloquial terminology, "Sleep Drunk." (Not to be confused with "Sleep Drunkenness.")

"It's just a case of prehypna intoxication, he's acting silly because he's been up for 32 hours."