Some people check a wristwatch; others use a smartphone app or the position of the sun. But although these methods will tell you what time it is, they won’t reveal your internal time – that is, the ...

The steady tick of a clock usually feels simple and dependable. Something swings or vibrates in a controlled rhythm and marks the passing of each moment. What you rarely notice is the hidden cost ...

The return to "standard time" is better for our health according to sleep scientists, but the time change can be disruptive, and our bodies must also adjust to more hours of darkness as we head ...