Dolphins can stay constantly alert for more than two weeks by sleeping with only half of their brains, researchers say. These findings suggest how dolphins can keep on the constant lookout for sharks, ...

Unique signature whistles—akin to personal “names”—join half-brain sleep, 20-mph bursts, 1,000-ft dives, mirror self-recognition, and even tool use on the growing list of dolphin super-skills.

Ever wonder how animals sleep in the wild? It's not always as you may think. From sloths who hang upside down from trees to dolphins sleeping with one eye open, the animal kingdom is full of quirky ...

Chronotypes define individual sleep-wake cycles and peak daily energy periods. Aligning routines with chronotype improves sleep quality and daily productivity. Natural light exposure and consistent ...

AI-generated summary reviewed by our newsroom. Read our AI Policy. Chronotypes define individual sleep-wake cycles and peak daily energy periods. Aligning routines with chronotype improves sleep ...