A healthy heart doesn’t beat as regularly as a metronome,it actually changes its rhythm with each beat. This constant variation in milliseconds between heartbeats is known as heart rate variability (HRV),Through the analysis of heart rate variability data, we can better understand our physical condition and heart health information.
Turn on scientific sleep in the watch settings or APP settings, and then wear the watch when you sleep, the watch will automatically collect heart rate data at night, and you can view the analysis results and statistical Lorenz charts the next day, the longer you wear it, the more accurate measurement you will get.