I thought I was thriving on 6 hours of sleep a night — then I showed a board-certified doctor my Apple Watch sleep tracking ...

How does your brain know when it's time to sleep? There are two main factors: Hours Awake. The longer you've been awake, the stronger your drive for sleep. Circadian Rhythm. Your body operates on a ...

When Charlotte Thornton was young, she’d watch her Nanna fall into a 10-minute sleep almost as soon as she sat down. “She would be so tired because, although she routinely went to bed at 10:30pm, ...