Dopamine neurons—the cells that drive reward and motivation while we're awake—become surprisingly active during nonrapid eye movement sleep right after we learn something new. The findings challenge ...

(Abstract composition of a woman surrounded by dreamy colorful clouds depicting the subject of sleep and imagination. Credit: agsandrew / Shutterstock.) Dreams have famously led to some pretty ...

You've probably noticed that you feel more alert and capable after a good night's sleep, and perhaps even that you perform better at work or in your studies. But what exactly is happening while you ...

Caffeine doesn't just make it harder to fall asleep; it changes how the brain behaves during rest. New research shows that caffeine alters brain activity in ways that make sleep look more like ...