Why is a short nap called a "cat-nap"?

Yeah, but they wake up really quickly and are alert almost immediately. Something in their brain chemistry is my understanding.

Try this. When you see a cat in a dead sleep, turn on the can opener.

They don't need coffee or nuthin'

My cats let us know they have no use for us by shunning canned food and even table scraps. One of them yells at me in the morning if their food bowl has fallen below a certain level and then it's all "Be gone, slave, I have a nap waiting".

Mine can be awakened from coma state with the mere crinkling sound of a cat treats bag opening.

Ohhhhh.....don't get me started on cat treat bags.