“Sullen monosyllabism, a sure sign of sleep deprivation.”
“standing in the neutral zone~ living on sleep deprivation.”
“There's no animal that sleep-deprives itself like the human.”
“Why are there five syllables in the word “monosyllabic”?”
“The next day I woke up in a sullen simmer, as if sleep had catalyzed my depression into a general state of pissed-offedness.”
“...too weary and dazed by unfinished sleep even to swear. There comes a degree of numbness in fatigue and exasperation which can be expressed only by a sullen silence.”