Ancient humans did not sleep continuously. They commonly slept in two shifts each night, separated by a period of wakefulness ...

It's a commonly held belief that before artificial lighting, human sleep was 'naturally' divided into two distinct periods, but how true is that?

For hundreds of years, night didn't mean a long sleep. Long before electric lights lit up homes and streets, people lived ...

My bed and I spend less time together than the experts say we should. Most nights, my head hits the pillow around 11:00 pm, and I’m up—without an alarm—at 5:30 am. That six and a half hours of shuteye ...