Most modern people sleep for about 6 to 8 hours at a time, but for most of human history, people slept twice a night. Darren Rose, a cognitive psychology lecturer at Keele University in the UK, ...

We used to have a few productive hours in the middle of the night, but that all went away during the Industrial Revolution.

In a modern world filled with blinking lights and flashing screens, sleep is becoming a rare commodity. So much so that as much as a third of the US adult population isn’t getting the recommended ...

For hundreds of years, night didn't mean a long sleep. Long before electric lights lit up homes and streets, people lived their lives according to the natural rise and fall of daylight. People changed ...

Sleep can feel like a luxury in the busy, modern world – but new research has found that it is necessary for more than just recharging our brain. The study, published in Nature Communications, traces ...

Sleep is one of life’s most universal behaviors. Despite its ubiquity, it’s also one of the most mysterious. Humans spend about a third of their lives with their eyes closed and their brains in states ...