At 8:42 p.m. and my house splits into two camps. On one: my 6-year-old is already asleep, starfished across her bed like she’s been training for this moment all day. My 9-year-old? Wide awake.

Restorative sleep happens during deep sleep and rapid eye movement (REM) sleep. Deep sleep repairs tissue and strengthens immunity, while REM supports learning and memory. Nonrestorative sleep means ...

Being an expert birdwatcher is more than a hobby. It’s a pastime that may alter the structure and function of your brain. And these changes may enhance cognition even as you age, new research suggests ...