The sleep cycle has three NREM stages and one REM stage. Deep sleep occurs in stage 3 and is crucial for feeling refreshed. REM sleep helps in processing and storing memories. The sleep cycle consists ...

Sleep does more than quiet conscious thought. During the deepest stages, slow electrical rhythms, changing blood volume and ...

Between wearables and phone apps, a growing number of tools claim to track your sleep. But experts say trackers can only go so far.

Sleeping and waking up at different times is associated with an increased risk of heart attack and stroke, even for people who get the recommended amount of sleep, according to new research. While ...

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 ...

Doherty says while he personally has a problem with a “sleep score”, he believes the widespread uptake of wearable devices is ...

In my last post, I asked, "Are you getting enough sleep?" Today, in an effort to better understand the role of sleep in our lives, I ask a very basic question: What happens when our heads hit the ...

Researchers at the University of Lausanne have identified a novel role for the brain's 'locus coeruleus' in sleep and its disruptions. This brain region facilitates the transition between NREM and REM ...

Time to give these so-called sleep hacks a rest? The team behind the sleep tracker Sleep Cycle crunched data from over 1 million global users to determine the social media slumber shortcuts that have ...

Everyone knows getting a good night’s sleep matters. And while naming the stages of the sleep cycle may be difficult, the benefits of deep sleep are felt every morning. For a healthy adult ages 18 to ...