Humans may rule the Earth, but the world is full of amazing animals of all shapes and sizes, and we're only just starting to learn how truly remarkable they are.
When it comes to sleep, scientists still don't fully understand the ins and outs of it. We know that sleep is an essential part of life (total sleep deprivation leads to death), but we're still unsure as to the reasonswhysleep is so important.
How Animals Sleep
Studying the various different sleeping habits of other animals, can help scientists crack the puzzle of sleep.
Did you know that certain marine animals can sleep underwater? And that some migrating birds can fly for six months straight without ever touching the ground?check out the infographic belowfor more amazing facts about how animals sleep.
Animal Sleeping Facts Explained
Dolphins and whales have the ability to sleep with only one-half of their brain at a time. This prevents them from drowning in their sleep.
The method is known as “logging” and it has been observed in bottle-nosedolphins. During sleep, the bottle-nosedolphin shuts down only half of its brain, whilst the other half remains ‘awake’ at a low level of alertness.
This allows the dolphin to retain control of their blowhole (through which they breathe), preventing them from drowning. An extract from anarticle in Scientific American:
Although still a matter of discussion, most researchers feel that in order to breathe, a dolphin or whale must be conscious and alert to recogniseits blowhole is at the surface.
Sea Otters will sometimes hold hands when they sleep so they don't drift away from each other.
Sea otters often eat, rest, and sleep together while floating in groups called rafts. A raft may have a few otters, or hundreds! Rafting sea otters sometimes “hold hands” to stay together.
Giraffes can go weeks without sleep. Being large and rather slow animals, they're constantly vulnerable to attacks from predators, and therefore cannot sleep for long periods.
Giraffes have developed some pretty unique sleeping habits, and sleep the least of any mammal.
When they're young, giraffes lay down to sleep, tucking their legs underneath their bodies and curling their heads round to rest on their rumps. However, adult giraffes in the wild barely get a chance to sleep in such luxury; and are forced instead to sleep standing up in short bursts. In fact, they almostnever sleep for longer than 5 minutesat a time.
Migrating birds can sleep whilst flying. Some species of birds fly for 6 months straight migrating, drinking and sleeping whilst airborne.
Scientists have found that migrating birds can fly for 200 days straight, eating and sleeping while soaring through the sky.
The Alpine swift wasstudiedby a group of scientists in 2011, and it was discovered that they appeared to fly nonstop.
The swifts eat bugs in mid-air, so that explains why they don't starve. But the results "raise the question of how or whether these birds sleep". The swifts activity appeared to raise and fall during flight, and the researchers speculate that the birds might still be able to control their flying while sleeping. The team concludes that "swifts do at least to some extent sleep while airborne."-Conservation Magazine
Cows like to sleep close to their families, and sleeping arrangements are determined by individuals' rank in the social hierarchy.
Cows are actually very intelligent and have a social hierarchywith a ‘boss’ cow. Any cows that don’t follow the leader become isolated from the herd.
Cows are also known to have deep maternal instincts. There have been various stories of cows who havehidden their babiesandran away from farmers.
Horses, Zebras and Elephants can sleep standing up. This is because they are 'prey' animals, and need to remain alert in case they are attacked.
Horses, zebras and elephants are just 3 examples of animals that can sleep standing up, because it allows them to quickly escape an attack by a predator (the process of standing up can be slow and clumsy).
However, horses, zebras and elephants will lie down when they require REM (Rapid Eye Movement) sleep. Typically, the amount of REM sleep they require is very small, so they don’t need to lie down often.
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Infographic Transcript: Amazing Animals & Their Sleeping Habits
Dolphins And Whales have the ability to sleep with only one-half of their brain at a time. This prevents them from drowning in their sleep.
Seat Otters will sometimes hold hands when they sleep so they don’t drift away from each other.
Giraffes can go weeks without sleep. Bring large and rather slow animals, they’re constantly vulnerable to attacks from predators, and therefore cannot sleep for long periods.
Migrating Birds can sleep whilst flying. Some species of birds fly for 6 months straight migrating, eating, drinking and sleeping whilst airborne.
Cows like to sleep close to their families, and sleeping arrangements are determined by individual's’ rank in the social hierarchy.
Horses, Zebras & Elephants can sleep standing up. This is because they are ‘prey’ animals, and need to be alert in case they are attacked.
The Sleepiest Animals May Surprise You...
The average amount of hours spent sleeping per day
- Giraffe 0.5/1.9/4.6 Hours (varied reports)
- Horse 2.9 hours
- Elephant 3.5 Hours
- Grey Seal 6.2 Hours
- Pig 7.8 Hours
- Human 8 Hours
- Chimpanzee 9.7 Hours
- Dog 10.1 Hours
- Baboon 10.3 Hours
- Dolphin 10.4 Hours
- Cat 12.5 Hours
- Tiger 15.8 Hours
- Sloth 14.4-16 Hours
- Opossum 18 Hours
- Giant Armadillo 18.1 Hours
- Little Brown Bat 19.9 Hours
Hibernation…
Some animals hibernate over the winter. Often referred as a very deep sleep, hibernating animals are doing much more than just sleeping; they’re undergoing physiological changes that can be very drastic (i.e. significant drop in body temperature).
Some animals that live in deserts also undergo a form of ‘summer hibernation’ called “estivation” to escape the blazing heat.
When an animal wakes from hibernation it shows many signs of sleep deprivation and needs to sleep a lot over the next few days to recover.
