When someone wakes up from a long, restless nap and gets pissed off at everything, often swearing and throwing pillows at other humans. That someone has nappers rage.
(Samwise gets pissed at Malcolm after a restless nap)
Malcolm: "Samwise calm down, man, you have you have nappers rage"
Samwise: "No I f***ing don't!" (violently throws pillow at Malcolm)
A person who can fall asleep/take a nap at anytime of the day, at any place in the world, in any situation and then wake up like a Phoenix reborn from the ashes.
Tom: Wow how can you fall asleep that fast? We were chatting fine and the minute I looked away, you started snoring.
Carrie: What can I say, I'm a power napper.