An upside-down jellyfish drifts in a shallow lagoon, rhythmically contracting its translucent bell. By night that beat drops ...

Researchers report sleep-like states in brainless marine animals, suggesting rest began as a basic cellular repair mechanism.

We recently experienced a very special day - February 12th, the 100th anniversary of the founding of the NAACP, and the two hundredth anniversary of both Abraham Lincoln's and Charles Darwin's ...

Even a boneless, gelatinous sack lacking a dedicated anus and brain needs its beauty sleep, a new study by researchers from Bar-Ilan University in Israel finds. Jellyfish sleep a third of every day ...

Turns out jellyfish and sea anemones – among the ancient creatures with a nervous system instead of a brain – have a very similar sleeping routine to our own. A new study published in Nature ...

Ever wondered how some animals manage to survive without the luxury of a good night's rest while we humans desperately need our eight hours? The animal kingdom is packed with creatures that seem to ...

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If we are ever to really understand dreams we are going to have put them in evolutionary context. But dreams are mental phenomena and not a directly observable physical trait. So how can we study the ...