With sleep impacting health issues like stress and weight, tracking REM and deep sleep can help you improve your nights.

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 ...

If you've ever woken up feeling groggy and sluggish even after a full night of rest, you might not be getting enough core sleep. What is core sleep? It's a term that encompasses the most restorative ...

Medically reviewed by Sohaib Imtiaz, MD Key Takeaways Deep sleep is essential for health, making up 20% to 25% of total sleep time.Not getting enough deep sleep can raise the risk of problems like ...

Light sleep is the beginning of your sleep cycle and your body's way of winding down. Breathing, heart rate and muscle changes prepare your body for the deeper sleep to come. Light sleep is broken ...

It has been known for nearly 20 years that slow, synchronous electrical waves in the brain during deep sleep support the formation of memories. Why that is was previously unknown. Now, writing in the ...

Americans are not getting enough sleep, and it’s starting to take a toll on our health. According to the Centers for Disease Control and Prevention (CDC), adults across the country are sleeping less ...

Can't get to sleep in the heat? Sleep specialists share simple, expert-backed ways to stay cool and sleep better on hot ...

Waking up to multiple alarms? Expert says it’s a clear sign you’re not getting enough sleep. Here’s how poor sleep affects ...