There are a few animals that have unique sleep patterns or exhibit minimal sleep, but it's important to note that all animals require some form of rest or sleep to function properly.
Bullfrog: Bullfrogs have been observed staying awake for extended periods, especially during the breeding season. While they do sleep, their sleep patterns can be irregular and disrupted during certain times.
Dolphin: Dolphins engage in a form of unihemispheric sleep, where only one hemisphere of their brain sleeps at a time while the other remains awake. This allows them to maintain some level of consciousness while resting and being aware of their surroundings.
Giraffe: Giraffes have short, intermittent sleep sessions lasting only a few minutes at a time. They often sleep standing up and require very little sleep compared to most mammals.
Albatross: These seabirds are known to sleep while flying. They can rest one hemisphere of their brain at a time, allowing them to fly for extended periods without fully sleeping.
Elephant: Elephants have a reduced sleep requirement compared to other mammals. They typically sleep in short bouts, often standing up, and can go for several days with very little sleep.
Bull shark: Bull sharks have been found to engage in unihemispheric sleep, similar to dolphins. They can rest while still remaining alert and responsive to their surroundings.
Hummingbird: Hummingbirds have a high metabolism and can enter a state of torpor during the night, where their metabolic rate significantly decreases. While in torpor, they conserve energy and have a lowered level of activity.
Great horned owl: Great horned owls are known for their nocturnal behavior. They have the ability to sleep during the day, often perched in trees, and become active at night for hunting and other activities.
These animals demonstrate a variety of sleep adaptations that allow them to fulfill their biological needs while adapting to their environments and lifestyles.