Sleepless Wonders:
Organisms That Never Sleep

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Sleep is a universal phenomenon that is essential for the well-being of most organisms.
However, there are a few organisms that never sleep.

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These creatures have evolved unique ways to stay awake and alert, even when their bodies are at rest. [{ "selector": ".aifrx-a", "duration": "500ms", "fill": "forwards", "delay": "0ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }]

Dolphins

They are able to stay awake and alert by shutting down only half of their brain at a time. [{ "selector": ".fcaxf-a", "duration": "500ms", "fill": "forwards", "delay": "0ms", "keyframes": [ {"offset": 0, "transform": "translateX(-334px)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }]

Bullfrogs

Scientists believe that bullfrogs may enter a state of deep rest that is similar to sleep but they do not go into full REM sleep. [{ "selector": ".xlolt-a", "duration": "500ms", "fill": "forwards", "delay": "0ms", "keyframes": [ {"offset": 0, "opacity": 0}, {"offset": 1, "opacity": "1"} ] }]

Alpine Swifts

Alpine swifts are small birds that can fly for months on end without landing. They are able to do this by entering a state of deep rest while they are flying. [{ "selector": ".irtuc-a", "duration": "500ms", "fill": "forwards", "delay": "0ms", "keyframes": [ {"offset": 0, "transform": "translateY(-403px)", "opacity": "1"}, {"offset": 1, "transform": "translateY(0)", "opacity": "1"} ] }]

Bluefish

Bluefish are predatory fish that are constantly swimming. They never sleep because they need to keep moving to get enough oxygen. [{ "selector": ".grnbc-a", "duration": "500ms", "fill": "forwards", "delay": "0ms", "keyframes": [ {"offset": 0, "transform": "translateX(-334px)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }]

Jellyfish

Jellyfish are another type of simple animal that does not need to sleep. They have a decentralized nervous system which means that they do not have a central brain. [{ "selector": ".obfwx-a", "duration": "500ms", "fill": "forwards", "delay": "0ms", "keyframes": [ {"offset": 0, "transform": "translateX(-334px)", "opacity": "1"}, {"offset": 1, "transform": "translateX(0)", "opacity": "1"} ] }]

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Sleepless Wonders:Organisms That Never Sleep

Sleep is a universal phenomenon that is essential for the well-being of most organisms. However, there are a few organisms that never sleep.