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 ...

Deep sleep helps you feel refreshed and typically makes up 20–25% of total sleep time, or about one to two hours per night for adults. If you're not sleeping soundly, certain strategies can help ...

We all know that after a bad night’s sleep, we feel below par the next day, with our energy, mood and ability to concentrate all impacted. But over longer periods, poor sleep can have serious ...

One ESSENCE beauty editor spent her holiday in the Equinox Hotel sleep lab—here’s how to deepen your sleep at home this ...