View image of All mammals sleep, especially cats (Credit: Images of Africa Photobank/Alamy Stock Photo) Origins What is the point of sleep? The real reason why we slumber Sleep
View image of Babies need far more sleep than adults (Credit: Weestock Images/Alamy Stock Photo) Almost human Humans do not need much sleep We actually snooze less than our closest relatives Sleep
View image of Brown-throated sloth (Bradypus variegatus) (Credit: Frans Lanting Studio/Alamy) Record Breakers The sleepiest animal in the world Sloths don't even come close to this Sleep
