Apple Watch shows that deep sleep is only 10 minutes.

Hello, I want to ask why Apple Watch shows that deep sleep is only 10 minutes. The reason why Apple Watch shows deep sleep is only 10 minutes is because of mental stress. Short deep sleep time is generally caused by mental stress, and the time displayed by Apple Watch is accurate. Apple Watch shows that deep sleep is only 10 minutes, which indicates that mental stress is great. You should adjust your schedule, learn to relax and exercise properly.