Jellyfish and sea anemones enter true sleep-like states despite lacking brains or centralized nervous systems. Sleep appears to protect neurons by limiting or repairing DNA damage caused during ...

Sleep appears to have developed much earlier in animal evolution than previously assumed, according to new studies on two brainless marine creatures. A study of the upside-down jellyfish Cassiopea ...

Sleep, it turns out, is not a luxury reserved for animals with big brains and busy calendars. New research shows that jellyfish drift into a nightly slumber that lasts about as long as a human’s, ...

Sleep can feel like a luxury in the busy, modern world – but new research has found that it is necessary for more than just recharging our brain. The study, published in Nature Communications, traces ...

Jellyfish and sea anemones are curious creatures: these organisms evolved without a brain and, as scientists discovered in the past several years, don’t need one to sleep. The animals do, however, ...

A new study from Bar-Ilan University shows that one of sleep's core functions originated hundreds of millions of years ago in jellyfish and sea anemones, among the earliest creatures with nervous ...

A new study analyzed the sleep patterns of jellyfish and sea anemones and found they share some sleep traits with humans. The research could provide insight into the origins and function of sleep.

Add Yahoo as a preferred source to see more of our stories on Google. Even a boneless, gelatinous sack lacking a dedicated anus and brain needs its beauty sleep, a new study by researchers from ...

An upside-down jellyfish drifts in a shallow lagoon, rhythmically contracting its translucent bell. By night that beat drops from roughly 36 pulses a minute to nearer 30, and the animal slips into a ...

NASHVILLE, Tenn. (WSMV) - It turns out sleeping isn’t just about resting your eyes, as a new study found that even ancient creatures without eyes — or even brains — need it too. A study published in ...