Deep sleep refers to slow-wave sleep — a stage in the sleep cycle when brain waves slow down. Getting enough deep sleep is crucial for numerous bodily functions. But how to increase deep sleep isn’t ...

Understanding the quality of a night’s rest requires more than just a single numerical value. Recognizing this, Fitbit has launched ...

"I have to get my deep REM sleep," expresses a common confusion about two very different types of sleep. Deep sleep and rapid eye movement (REM) sleep are not the same; they do not even overlap. They ...

Most people associate good sleep with feeling refreshed, improving mood, or simply recovering from a long day. While these benefits are well known, emerging research suggests that deep sleep may play ...

Sleep scientists have one meaning for this term. Your Apple Watch has another.

Now that we have wearables tracking our every move, a lot of us can look at stats that supposedly tell us how well we’ve slept the night before. But sometimes, it can feel like your sleep tracker is ...