We all wake up very briefly between sleep cycles, which last about 90 minutes, and typically “don’t know it’s happening and go right back to sleep,” Shelby Harris, PsyD, DBSM, a clinical psychologist ...

Many of us obsess over how much sleep we get each night, and the dangers to our health of not getting enough, but really, there is another way ...

Genetics shape when we function best. Aligning routines with biology beats forcing a one size fits all 5am start.

Learn how caffeine affects brain chemicals and health, sleep, and mood. Understand safe daily limits, hidden sources, and signs you’re getting too much.

How we feel about a night’s sleep can have a bigger impact on mood and grogginess than actual hours of rest. Here’s how to ...