Slumbering Brainless Jellyfish Unravels Evolutionary Secret of Sleep

Rodiano Bonacci
Settembre 25, 2017

To study the sleep behaviour scientists have always experimented with animals to trace the origins of this neurological behaviour.

From the tiniest animal like the flies to the blue whale, all sleeps. But a new study from a trio of California Institute of Technology (Caltech) researchers suggests that brains aren't a prerequisite for sleep, as evidenced with the Cassiopeiajellyfish. Science Magazine noted that these upside-down jellyfish pulse their bells at least once per second, using water to cleanse their bodies and provide sustenance.

At nighttime, the scientists found, the jellyfish goes through periods where it pulses less often, only every 39 times per minute compared to about 58 times per minute during the day. Bedbrook notes that they are "like weird plant animals,". At first, the jellyfish weren't too responsive, but another attempt at lifting them off their preferred spots was far more successful, as the creatures immediately swam back to the bottom.

A scientific research recently has proved that even jellyfish displays sleep like behaviour.

It was noticed that the creature's daytime activity was reduced if it was deprived of sleep the previous night.

"Everyone we talk to has an opinion about whether or not jellyfish sleep". This finding opens up many more questions: Is sleep the property of neurons? But in order to see if that theory is correct or not, more research might be needed on jellyfish and their sleeping habits.

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