The brain waves during stage 1 NREM sleep transition from daytime patterns to nighttime patterns. Stage 2 NREM sleep is when most people would consider themselves to be "asleep." The heart rate and ...

REM sleep goes even deeper into brain recovery, dreaming and processing memories and emotions. This is the sleep stage in which your eyes move rapidly. If you've ever caught your dog or cat in a REM ...

A good night’s sleep isn’t just about the number of hours you log. Getting quality sleep — the kind that leaves you feeling ...

That means stages 1 and 2, which are sometimes called “light ... It has the slowest brain waves, so it’s sometimes called “slow wave sleep.” It’s hard to wake someone up from this ...

While the verdict on its cause is not clear, Alzheimer's is thought to be caused by a combination of factors, including abnormal protein buildup (plaq ...