You’re staring at your aquarium. It’s late. Everything is quiet. And there’s your fish, floating calmly, fins moving slowly, eyes wide open. Are they... asleep? Or just zoning out? Fish don’t come ...

So many of our childhood bedtime books revolved around what exactly animals do when the sun goes down, tales that not-so-subtly encouraged us to also fall fast asleep. Do you remember these books? The ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. Could you explain how fish sleep? Do they drift ...

There are tens of thousands species of fish around the world, whether it's in an aquarium, river, lake, or ocean. Like all animals (and humans), every single one needs some form of rest for cognitive ...

Going to the zoo and aquarium can be a magical experience. You get to see animals you’ve only ever read about in real life — monkeys, penguins, sharks, whales, etc. — up close. But have you ever ...

Many grad students can sympathize with the blind form of the Mexican tetra. Researchers speculate they sleep only a few hours a night, because they simply don't have time to rest. Subscribe to read ...

Contrary to common belief, not all vertebrates regulate their sleep-wake rhythm in the same way. University of Basel researchers have discovered that some fish – unlike humans – do not need orexin to ...

Add Yahoo as a preferred source to see more of our stories on Google. Betta, or Siamese fighting fish, are one of the most popular aquarium fish in the world. Originating from southeast Asia, betta ...

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 Michael Heithaus, Florida ...