![]() Because of their size, they need to spend up to 18 hours per day eating 200-600 pounds of food/day! They sleep standing, leaning on a tree or termite mound, or lying on their side. Horses sleep 2.5 hours/night and tend to nap for 15 minutes at a time.Until the 1950s, researchers believed that they didn't sleep at all. For this reason, they will often sleep standing up and may rest their head on their rumps. Because getting up from the ground takes them a little time, lying down makes them more vulnerable to predators such as crocodiles and lions. Giraffes sleep 30 minutes to 2 hours per day, often broken up into smaller sections.Dolphins will sleep with one side of their brain asleep for 2 hours, then switch and sleep with the other side of their brain. Some dolphins will swim while they sleep, others will float and look like a log. The one eye keeps an eye out for predators, and they can come to the surface to breathe. Dolphins sleep with half of their brain asleep (called unihemispheric slow-wave sleep or USWS), as many birds do, which means that only one of their eyes will work (the one opposite the hemisphere that is awake).It's believed that this keeps them safe from predators and keeps them warm as they haven't developed blubber stores yet. Orca calves spend the first few months of their lives swimming around, even if their parents are asleep.Sometimes they'll bite down onto ice sheets with their teeth while they sleep. Walruses can go for 84 hours with no sleep! When they do sleep, they can sleep anywhere on land, on the bottom of the ocean, even floating.Alpine swifts fly from Switzerland to West Africa for 6 months straight without stopping! It's unclear if they sleep or rest while in flight.Male impalas in particular rarely let their guard down as they're watching the herd. They do sleep deeply during hibernation in the winter. Bullfrogs go without sleep for months at a time! Though they close their eyes and rest, they remain alert and will respond to painful stimuli and show changes in respiration.Here are the animals that need the least amount of sleep: Larger animals tend to need less sleep than smaller ones, and those that graze sleep less than carnivores that eat big meals.
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