Add Yahoo as a preferred source to see more of our stories on Google. A protective mucous cocoon surrounds this parrotfish as it sleeps in Australia's Great Barrier Reef. This layer of protection ...

Tom has a Master's degree in Journalism. His editorial work covers anything from archaeology and the environment to technology and culture. Tom has a Master's degree in Journalism. His editorial work ...

Fish don’t have eyelids. They don’t curl up in beds or snore, so it’s easy to assume they just keep swimming forever without rest. But they do sleep—it just looks very different from how we do it.

A study has found that observing how actively a fish moves in its youth and when it sleeps can help predict whether it will ...

Sleep is thought to be vital for the health of animals including us, but one kind of cavefish can somehow manage without it. Yet the cavefish appear to be healthy despite this lack of sleep, with ...