Okay, my dear INTP boyfriend needs his sleep. If he doesn't, he gets in a most desperate state.
I'm blaming his desperate need for sleep on his constant thinking abilities. His extreme thinking zaps the energy right out of him.
My youngest son (20), also a dear INTP, can sleep 12+ hours if I let him. I can blame it on his being on a computer 12+ hours a day, though (playing online strategy games).
Thankfully, I do like to sleep, but I don't need it... not like they do.
Any other INTPs out there that experiences this to this extreme?