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Add Yahoo as a preferred source to see more of our stories on Google. Cole Kan/CNET If you're a light sleeper who's sensitive to sound, then you know how difficult it can be to catch some Zs.

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 ...

Sound machines promise better sleep, but new research suggests they may quietly steal your REM and deep sleep.

Deep sleep is one of the most essential stages of the sleep cycle, playing a vital role in how well you feel both physically and mentally. Often referred to as slow-wave sleep or delta sleep, this ...