Study shows elephants slack on sleeping

WASHINGTON - There's an old saying that elephants never forget. You also can say they seldom sleep.

Scientists have said a first-of-its-kind study tracking the sleep behavior of wild elephants found the world's largest land mammal sleeps two hours per day on average, and some days not at all, and does so mostly standing up.

This represented the shortest-known sleep time of any mammal. Previous research showed captive elephants got four to six hours daily.