Sleep is often treated as a casualty of modern life. Artificial lighting, shift work, endless notifications and late-night entertainment are usually blamed for cutting into the hours people spend ...

A number that sounds like plenty for humans turns out to be the smallest ration of sleep in the entire primate order. Biologists are still working out why. Seven hours sounds like a reasonable, even ...

We spend one-third of our lives asleep. This biological fact is something that, with time and technology, is less and less taken for granted. In many science fiction stories, the future of sleep is ...

Human sleep is shaped by a complex interplay of cultural norms, ecological conditions and biological imperatives. Ethnographic and evolutionary evidence reveals that sleep timing, duration and quality ...