How to turn on iPhone sleep monitoring?

1, first turn on the "health" function that comes with Apple's mobile phone.

2. After entering the health function page, click "Start using" in setting sleep.

3. Click "Next" after setting the sleep goal.

4. After setting the time and start date of the first timer, click "Add" in the upper right corner.

5. After setting the sleep time, click "Enable Sleep Mode".

6. After reconfirming the sleep goal and time, click "Finish" below.