Why do giraffes only need to sleep a few minutes at a time? Unlike humans, giraffes survive on just 30 minutes to two hours of sleep per day, often in short naps of a few minutes. Sleeping longer would leave them vulnerable to predators like lions, so evolution adapted them to stay alert. Sometimes, giraffes even sleep standing up, though the deepest rest comes when they curl their long necks back onto their bodies. Despite their size, these animals have mastered the art of living with almost no