This is someone in longterm stimulant addiction. Binges on stimulants and doesn’t sleep (late night social media ranting), then 1-3 days later, can’t stay awake. Needs diapers for drug-induced incontinence, binges of high-fat, high-carb foods after he comes down. Oh, yes, and incoherent ranting with delusions of grandeur. Pair this addiction with untreated NPD and . . . voila. 

I hope he gets the help he needs from the correctional facility mental health team.