If you wish to change the time (bedtime/wake-up time) for "Sleep" entries recorded on the timeline, please follow these steps:
Tap the "Sleep" entry (record) you want to change to open the content details screen.
Tap the edit icon displayed above the sheep illustration.
A screen to change the date and time will appear. Please set the "Bedtime" and "Wake-up time" to your desired date and time respectively.
After making changes, tap "Post" to complete the process.