Article Source: “The ultimate power nap: Researchers use ‘Fitbits’ to track elephant sleep in the wild.”  ScienceDaily, 2 March 2017 <www.sciencedaily.com/releases/2017/03/170302115731.htm>. Materials provided by University of the Witwatersrand.  Behavioral studies of elephant sleep in zoos record that they sleep around four hours per day and can sleep standing up or lying down — but how much do they […]