During the first hour after waking up: In the morning ... As it starts to get dark outside, your brain receives the signal that it's time to wind down and go to bed. During the night: The darkness ...

Struggling to get up in the morning? Here are four ways to ditch the grogginess and feel human before breakfast.

And when you don’t get enough shut-eye, your health can suffer. Over time ... they’re stressed out. You end up lying awake in bed, worrying about an appointment you have the next morning, ...