Sleep is divided into two broad categories based on whether our eyes move (rapid eye movement sleep; REM) or not (non-rapid eye movement sleep; NREM). Over the course of a night, we will cycle between these two categories four to six times.…
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Heart rate variability, or HRV, is the difference in time between heartbeats. Although we might assume our hearts beat steadily like a metronome, they don’t. The subtle “chaos” in timing gives us clues as to how well our autonomic nervous system is working.…
