● Nightly Recharge Nightly Recharge output is based on sleep measurement results (sleep analysis). It lets you check to what degree your body and mind recover, through sleep, from workouts and the load factors sustained throughout the day.?
The results are also used to provide personalized tips to help you plan a healthy lifestyle and a training regimen to achieve your goals.?
https://support.casio.com/global/en/wat/app/gbd-h2000/polar/nightly-recharge/

● Sleep Measurement
Sleep measurement displays the following items:? sleep time, bedtime, wakeup time, sleep stage, and sleep status. It lets you" check the quality of your sleep on a graph and tells you how long you slept.