Wild elephants clock shortest shut-eye recorded for mammals
Average snooze of two hours per night deepens mystery of sleep’s role
![wild elephants](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/03/030117_SM_elephant-sleep_main.jpg?fit=860%2C460&ssl=1)
SLEEP DIARIES The first study of electronically monitored sleep in two wild elephants (one shown above) finds a record-breaking low average for mammals.
P. Manger