Seals have highly variable sleep patterns: while resting on land, they can sleep over 10 hours a day, but during long foraging trips at sea, some species like Northern elephant seals average only about two hours of sleep daily, taking short, deep naps while diving to avoid predators. They achieve this by sleeping in short bursts (around 10 minutes) during deep, silent dives, sometimes spiraling downwards as they enter REM sleep.
The new findings, partially funded by the U.S. National Science Foundation and published in Science , show that while elephant seals may spend 10 hours a day sleeping on the beach during breeding season, they average just 2 hours of sleep per day when they are at sea on monthslong foraging trips.
Koala – 22 hours
Found only living in Australia, they mainly live in the eucalyptus trees and spend around 22 hours of their time sleeping (90%).
When certain seal species sleep in the water instead of on land, they use a technique called “bottling”, in which they float vertically in the water with only their heads above the surface so they can continue to breathe.
Yes, the Navy SEAL sleep trick (an 8-minute power nap with elevated legs) is a real technique for quick rest, popularized by former SEAL Jocko Willink, that helps improve alertness and reduce fatigue, though its effectiveness depends on individual relaxation skills and it's not a substitute for full nighttime sleep. The method involves lying down, elevating your feet above your heart (on a chair or couch), relaxing facial muscles, dropping shoulders, and clearing your mind for about 8-10 minutes to promote relaxation and blood flow, preventing grogginess.
Own Your 3-Foot Space In Navy SEAL training, there's a simple but profound principle: Own your 3-foot space. It means focusing on what's directly within your control—your actions, your attitude, your effort—no matter how chaotic the environment around you becomes.
10 hours before bed: No more caffeine. 3 hours before bed: No more food or alcohol. 2 hours before bed: No more work. 1 hour before bed: No more screen time (shut off all phones, TVs and computers).
Life span. Blue whales live around 80–90 years or more.
The longest ever recorded dive by a whale was made by a Cuvier's beaked whale. It lasted 222 minutes and broke the record for diving mammals. Other whales can also hold their breath for a very long time. A sperm whale can spend around 90 minutes hunting underwater before it has to come back to the surface to breathe.
Most scientists agree that the most likely reason why 17-year cicadas spend so long underground is to avoid predators. By coming to the surface in such a large group, some cicadas get eaten but many cicadas will survive.
Nonetheless, soaring frigatebirds appeared to use unihemispheric sleep to watch where they were going while circling in rising air currents. Despite being able to engage in all types of sleep in flight, the birds only slept for 0.7 h d−1 during flights lasting up to 10 days.
The answer is “probably.” Research has shown that many animals experience a sleep phase similar to humans known as REM (Rapid Eye Movement) sleep, which is closely associated with dreaming. This phase is characterized by increased brain activity and is when most vivid dreams occur.
If they get intimidating, slowly and gently but assertively move away. Pushing, nudging and vocalisations may be signs that the seal would prefer to be left alone. Swatting their fore flipper towards you or crash-diving means 'go away' in seal language!
A powerful mindset to carry is the Navy SEALs 40% Rule: When your mind says you're done, you're only actuallly about 40% done. Physical injuries aside, our bodies are often far stronger than we think - the mind usually quits first, acting as a protective barrier rather than reflecting true limits.
💤🐘 A study tracking the sleep behavior of wild elephants found that they sleep two hours per day on average, and some days they don't sleep at all! This is the shortest-known sleep time of any mammal.
Deep-Sea Sponges
A deep-sea sponge can break the records of all living animals. It can live up to a thousand years. In fact, a study revealed that the oldest of the sponge samples collected lived for 11,000 years. During this time, the earth has just recovered from the Ice Age.
The killer whale is one of the only predators of the blue whale. However, only certain populations of this species include whales in their diets, which, just like their hunting techniques, vary from one population to another. Like a pack of wolves, killer whales work in coordinated teams when pursuing their prey.
Collisions with ships, or ship strikes, are one of the biggest threats facing blue whales today. This happens when shipping lanes are constructed in areas where whales are found. Due to their huge size and low agility, blue whales are very vulnerable to ship strikes.
Chris Lemons survived without oxygen for nearly 30 minutes due to a combination of his body being saturated with oxygen from the heliox gas he breathed (a helium-oxygen mix) and the near-freezing North Sea water rapidly cooling his body and brain, drastically slowing his metabolism and oxygen demand, a phenomenon often called "diving stasis," though experts still call it a miracle. His tissues held oxygen reserves, and the cold reduced his body's need for it, allowing him to last until rescue, an event documented in the film Last Breath.
The patient was conscious and lucid the entire time. He stated that at the time of the attack he was scuba diving in less than 20 fsw at the sea lion colony with a group of 24 other divers under the supervision of at least one guide. After the attack fellow divers and the crew helped him back aboard the ship.
The koala is famous for sleeping around 20-22 hours a day, which is about 90% of the day, due to their low-energy diet of eucalyptus leaves that requires extensive digestion. Other extremely sleepy animals include the sloth (up to 20 hours) and the brown bat (around 20 hours), with some snakes like the ball python also sleeping up to 23 hours daily.
Most healthy adults should aim for 7 to 9 hours of sleep a night, though the exact amount depends on your age, activity level, and health status. It's important to stick to a consistent sleep schedule, going to sleep and waking up at the same time every day.
On average, Japanese sleep about 7 hours and 20 minutes a night, - the least among 33 OECD member countries. And the number of insomniacs is growing. But even as more people suffer from insomnia, help can be hard to find.