Hello 706TSAL,
You should be able to adjust your sleep schedule using the steps below:
1. Tap Browse at the bottom right, then tap Sleep.
2. Scroll down to Your Schedule, then tap Full Schedule & Options.
3. Do one of the following:
• Add a sleep schedule: Tap Add Another Schedule.
• Change a sleep schedule: Tap Edit for the schedule you want to change.
4. Do any of the following:
• 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.
Note: You can’t select a song for a sleep schedule alarm. However, you can select a song for an alarm with the Clock app 
.
5. When you’re finished, tap Add or Done.
When you tap Done, the changes apply to every day in the schedule.
You can also find those steps in this resource: Add or change sleep schedules in Health on iPhone - Apple Support
Should the sleep schedule still not reflect the options you've selected, you'll want to reach out to Apple Support so they can look into this further: Contact - Official Apple Support
Take care.
