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 ...

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, a team of ...

“There is increasing evidence that sleeping in a cooler room can, in fact, improve sleep quality, but it’s not just about ...

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

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