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  2. Sleep in fish - Wikipedia

    en.wikipedia.org/wiki/Sleep_in_fish

    However, other fish do seem to sleep, especially when purely behavioral criteria are used to define sleep. For example, zebrafish , [ 6 ] tilapia , [ 7 ] tench , [ 8 ] brown bullhead , [ 9 ] and swell shark [ 10 ] become motionless and unresponsive at night (or by day, in the case of the swell shark); Spanish hogfish and blue-headed wrasse can ...

  3. Sleep in animals - Wikipedia

    en.wikipedia.org/wiki/Sleep_in_animals

    Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...

  4. Sleeping fish? From sharks to salmon, guppies to groupers ...

    www.aol.com/news/sleeping-fish-sharks-salmon...

    A large group of yellowfin tuna swimming off the coast of Italy. Like all fish, they sleep, but it's not like human sleep. Giordano Cipriani/The Image Bank via Getty Images Curious Kids is a ...

  5. Somniosidae - Wikipedia

    en.wikipedia.org/wiki/Somniosidae

    The Somniosidae are a family of sharks in the order Squaliformes, commonly known as sleeper sharks. [1] The common name " sleeper shark " comes from their slow swimming, low activity level, and perceived non-aggressive nature.

  6. Pacific sleeper shark - Wikipedia

    en.wikipedia.org/wiki/Pacific_sleeper_shark

    The upper jaw teeth of the sleeper shark are spike-like, while the lower jaw teeth are oblique cusps and overlapping bases. This arrangement allows grasping and sawing of food too large to swallow. Pacific sleeper sharks have a short caudal fin, which allows them to store energy for fast and violent bursts of energy to catch prey. [8]

  7. Got Holiday Stress? Here Are 10 Nighttime Activities to Help ...

    www.aol.com/got-holiday-stressies-are10...

    A 2015 sleep study has found that people who sleep in cluttered rooms are more likely to have sleeping problems including trouble falling asleep and rest disturbances. Avoid these sleep threats by ...

  8. 40 Facts About Animals That Might Make You Look Like The ...

    www.aol.com/68-fascinating-animal-facts-probably...

    One morning, while the soldiers were sleeping, Stubby smelled a gas attack and roused the regiment with barks and bites, likely saving their lives. Later, Stubby would help locate wounded soldiers ...

  9. Southern sleeper shark - Wikipedia

    en.wikipedia.org/wiki/Southern_sleeper_shark

    The southern sleeper shark feeds primarily on cephalopods, especially squid — including the giant and colossal squids — and numerous fishes.Documented stomach contents of individual sleeper sharks have also, albeit infrequently, contained the remains of marine mammals or seabirds, possibly as a result of scavenging on sunken carcasses or whale falls. [1]