I drag myself out of bed ... time they need to go to sleep. In the morning, that melatonin could still be in production mode, causing sleep inertia, a temporary state of grogginess upon waking up ...

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 ...

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, ...

The survey also asked when participants typically went to bed, when they got up in the morning ... to go online. “Our study shows that even small reductions [in screen time] could improve ...