Hi hanry32,
If you're having an alarm that you didn't set and cannot find in the standard alarm section of the Clock app, you may have a sleep schedule configured with its own alarm established.
Change the next wake up alarm on iPhone and Set up a schedule for a Sleep Focus in Health on iPhone outline this functionality in greater detail:
"When you set up a Sleep Focus, you can set your next bed and wake up times. This schedule repeats only once. To set up a recurring sleep schedule, do the following:
- In the Health app, tap Browse at the bottom right, then tap Sleep.
- Scroll down to Your Schedule, then tap Full Schedule & Options.
- Tap Set Your First Schedule, then select your options:
- Set the days for your schedule: Tap a day at the top of the screen to add or remove it from your schedule. The schedule applies only to days shown with solid-color circles.
- Adjust your bedtime and wake up schedule: Drag
to change your bedtime,
to change your wake up time, or the semicircle between the icons to shift both times simultaneously.
- Set the alarm options: Turn Alarm on or off.
- When Alarm is turned on, you can choose a sound, its volume, a vibration, and the snooze option.
4. Tap Add."
You can use those steps to turn that alarm off if enabled.
Regards.