Do elephants suffer from insomnia?

The tip of an elephant's trunk is seen at Ban Ta Klang Elephant Village, Surin province, Thailand, on Saturday, Nov. 26, 2016. Ever since the craze for Kopi Luwak, an Indonesian coffee originally made from part-digested beans defecated by wild palm civets, began more than a decade ago, coffee connoisseurs have sought unusual ways to make the perfect brew. Black Ivory Coffee Founder Blake Dinkin uses elephants to process his beans. The resultant coffee can be bought online at approximately $1,900 a kilogram. Photographer: Taylor Weidman/Bloomberg

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

Scientists recently said a first-of-its-kind study tracking the sleep behaviour 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.