Sleep is essential — researchers are trying to work out why
Nature, Published online: 09 April 2025; doi:10.1038/d41586-025-00964-wA typical person spends more than 20 years in a state of dreamy semi-consciousness. But surprisingly little is known about why we need this down time.

Nature, Published online: 09 April 2025; doi:10.1038/d41586-025-00964-wA typical person spends more than 20 years in a state of dreamy semi-consciousness. But surprisingly little is known about why we need this down time.