Humans and animals need to do several things to pass on their genes: eat, avoid being eaten, reproduce and sleep. Missing any of these biological imperatives leads to death. But when we’re asleep we can’t perform those other functions. One of modern science’s big mysteries, then, is: why do we sleep?
http://theconversation.com/why-its-so-important-to-understand-how-elephants-sleep-74780?utm_medium=email&utm_campaign=The Weekend Conversation – 70495300&utm_content=The Weekend Conversation – 70495300+CID_f818df4d8175a7eb8215a482abc52cdc&utm_source=campaign_monitor_africa&utm_term=Why its so important to understand how elephants sleep