I can confirm that sleep deprivation is a motherfucker. One of the worst parts about it is that it fucks with your ability to regulate emotions as much as it fucks with your physical health in the long term. Shit you'd find slightly annoying can suddenly cause you to get into full on brawls, you can become either completely apathetic or severely depressed in the span of maybe an hour, and then there's the fucking giddiness that never seems to go away which causes even more stress based on how it clashes with your emotional state. Then again, it's supposedly different from each person.