C reatures that sleep during the day and are active at night are known as nocturnal, and they take the form of both predators ...

other species have different ideas about what constitutes a good night’s (or day’s!) sleep. BBC Bitesize takes a look at the surprising ways four different animals get their shut-eye.

January often feels like a month when we should be hibernating, emulating a dormouse or a hedgehog and tucking ourselves up ...

Cats have different sleep-wake cycles than other animals and are often busy at night. This is because cats are crepuscular, which means they hunt and are active in the evening or early morning.

What has puzzled researchers and philosophers for many centuries is the ‘why’ of sleep, along with the ‘how’. We human ...

All animals need sleep. Explore why and how it evolved ... jellyfish also sleep I was so engrossed in writing the paper last night that I didn't notice how late it was getting.