catnapper

noun

1. One who takes a short sleep or nap.

   “Besides, I reflected, Joe might easily have become a catnapper, as so many millions of other Americans had become since Sarah Perkins, during the campaign, had made it so widely known that although the incumbent President slept in a bed with the covers over him for three and sometimes four hours a night, she herself never slept at all except for the catnaps.”

2. The kidnapper of a cat.

   “Mr. Harding was contacted by the catnappers, and arrangements were made for him to pay a ransom and recover the animal.”