Train and bus drivers, doctors and carers, employees in companies where machines run around the clock: In many industries, people work in shifts. Some start early in the morning, or at midday. Others ...

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 ...

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 ...