Can sleep deprivation ever really be good?

I'm puzzled.  My adult son (autistic/ADHD) feels better if he doesn't sleep.  The longer he's awake, the better he feels.  And, when he is eventually forced to sleep because his body takes over, he feels really bad both physically and mentally - neck and joint pain/discomfort, feeling his body is misaligned and often very distressed and angry too, triggering lots of connections to past negative experiences.

Naturally all of this flies in the face of the usual advice on the benefits of sleep and he really wants information on either how to stay awake longer or do polyphasic sleeping so that he never suffers the problems associated with sleeping for too long.  

To me this all feels like a very unhealthy relationship with sleep and one that is likely to be reinforced as he sleeps less and less and notices the benefits   So how might I help him?