how does a fish sleep
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How Do Fish Sleep?
Fish sleep in a variety of ways, just like mammals do. Some simply drift, with the occasional tail or fin flick to keep them steady. Others hover at the surface or near the bottom. Some snooze under rocks or in holes. Some fish even create “nests” for themselves in the sand. Still others sleep in schools, with some in the group resting while others keep a lookout for predators. Bizarre fact: Some parrotfish sleep inside a cocoon of mucus they secrete from glands inside their gills. The cocoon protects them from parasites and masks their scent from predators.
Fish sleep-wake patterns are a lot like ours. While some fish are nocturnal, most are active during daylight hours and become still and unresponsive at night. One key difference between fish and human sleep is that fish tend to remain alert to danger even while sleeping, so they can make a quick escape if they feel threatened. One notable exception is the reef-dwelling Spanish Hogfish, which sleeps so soundly that it can be lifted all the way to the surface of the water before it “wakes up.”
Fish sleep in a variety of ways, just like mammals do. Some simply drift, with the occasional tail or fin flick to keep them steady. Others hover at the surface or near the bottom. Some snooze under rocks or in holes. Some fish even create “nests” for themselves in the sand. Still others sleep in schools, with some in the group resting while others keep a lookout for predators. Bizarre fact: Some parrotfish sleep inside a cocoon of mucus they secrete from glands inside their gills. The cocoon protects them from parasites and masks their scent from predators.
Fish sleep-wake patterns are a lot like ours. While some fish are nocturnal, most are active during daylight hours and become still and unresponsive at night. One key difference between fish and human sleep is that fish tend to remain alert to danger even while sleeping, so they can make a quick escape if they feel threatened. One notable exception is the reef-dwelling Spanish Hogfish, which sleeps so soundly that it can be lifted all the way to the surface of the water before it “wakes up.”
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Fish sleep by opening their eyes because the don't have eyelids.
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