It can be. As a youngster (early 20s), I participated in sleep deprivation and oxygen deprivation experiments. (That might explain a few things Ha.)
I viewed video tapes of myself in both situations and they were quite similar. Your brain ceases to function normally when it lacks sleep or oxygen.
Ive seen footage of myself sitting cross-legged on the floor and unable to play patty-cake.
Its embarrassing, but after 72 hours without sleep your brain does its own thing. My dad claimed to have been ordered out on 72 hour patrols in Korea that brought it home to me he wasnt in a controlled environment like I was.
After a certain amount of time they can tell you anything, or claim you said anything, and you dont know any different. Your brain is fried at that point.
Thats also the problem, IMO. Id like to see them die for what they did and what they know but wont tell, versus what they are confused about. But at the end of the day I wont miss a wink of sleep either way.
I'll second that.
Another neat trick is to allow 45-minute 'naps', with 15-minute wakeup periods after about 36 hours.
After about three of those 45/15 minute cycles, the hallucinations are right around the corner.