(HealthDay News) -- Sleep apnea, most often characterized by loud snoring, occurs when breathing pauses briefly or becomes shallow during sleep. This often results in poor sleep and can make a person very tired during the day.

The U.S. National Heart, Lung and Blood Institute says common ...

Why can some people sleep through car alarms and thunderstorms, while others wake up at the sound of footsteps?

Researchers believe they've found the answer tucked in "sleep spindles," or bursts of brain activity that occur only during sleep.

A study out today in Current Biology...