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The 4 Stages of Sleep: What Happens During Each Cycle

As we sleep, our brain moves through four stages and two phases: non-rapid eye movement (NREM) and rapid eye movement (REM). The brain has four stages within the NREM phase. Each stage and phase of ...
Yahoo

REM vs. Deep Sleep: Here's What Actually Happens When You Sleep

Add Yahoo as a preferred source to see more of our stories on Google. Person wearing a wearable sleep tracker in bed Light sleep is the beginning of your sleep cycle and your body's way of winding ...
Los Angeles Times

Tired All the Time? Your Sleep Cycles (Or Sleep Calculator) Could Be the Key to More Energy

Ever wonder why some mornings you wake up ready to go, and others you feel like a zombie? The difference often comes down to when you wake up during your sleep cycle, and that’s exactly what a sleep ...
AOL

Getting Less of These Two Sleep Stages Can Give You an Alzheimer's-Like Brain

A new study reveals that not getting enough of specific stages in the sleep cycle may be linked to cognitive decline and potentially may lead to Alzheimer's disease. Researchers from the Yale School ...