Wrong manual sleep entry on health app-need to correct

It is not clear from your post exactly what sleep data you manually entered on your iPhone 17 Pro Max running iOS 27.

Could you clarify where you entered the information and what exactly you entered?

When you manually add sleep data, you enter a start time and an end time, which determines the recorded sleep duration. For example, if you entered:

26-Sep-2026, 22:00 → 26-Sep-2026, 23:00 = 1 hour

You can reduce the duration to zero by changing the end time to the same time as the start time:

26-Sep-2026, 22:00 → 26-Sep-2026, 22:00 = 0 hours

So, please clarify whether you manually entered a sleep period such as this, or whether you entered some other type of sleep information.

For example, did you manually enter:

• Sleep duration by specifying a start and end time
• Sleep Stages: Asleep, Awake, REM, Core, or Deep
• Sleep Duration Goal
• Sleep Schedule / Bedtime and Wake-up time
• Or some other sleep-related data?

This distinction is important because manually recorded sleep data and Sleep Goals/Schedules are different types of information and may be handled differently by the Health and Sleep systems.

If your issue is specifically with manually entered sleep duration, please also mention the original time range you entered and what you changed it to. That will make it much easier to understand exactly what is happening.