Apple phones have hidden alarm clocks. How to turn it off?

Apple's mobile phone has a hidden alarm clock and can't be turned off. It may be a healthy sleep alarm clock. You can refer to the following methods to turn it off:

Operating tools: iPhone8, iOS 14.

1, first open the phone and click Health;

2. Enter the health menu and click Sleep;

3. Enter the sleep state menu and slide the mobile phone screen upward;

4. In the sleep state, find and click all the timings and options;

5. Enter all the timing and options menus and find the sleep timing function;

6. Turn off the switch behind the sleep timer function and finish, so that the hidden alarm clock will be closed and finished.