Sleep tracking in watchOS nine gives more insights Using the introduction of sleep stages. Apple Watch employs signals from the accelerometer to estimate when consumers are in REM, Core, or Deep snooze. Apple Watch Series eight takes a novel method of temperature sensing by using a two-sensor design — 1 https://luisg169isb5.gynoblog.com/26553807/5-simple-techniques-for-how-does-apple-watch-band-work