Sometimes it happens that you cannot edit or delete your “Wake Up!” and “Sleep Well!” tasks; it may also happen that they duplicate themselves.
If you want to edit your “Wake Up!” and “Sleep Well!” tasks by tapping on them, you probably have to check if your Structured and iOS on all of your devices are up to date, as this often causes a lot of trouble.
In case this doesn’t work, please try to restore an older Backup and check if the issue persists. Automatic Backups should be made regularly as long as iCloud is enabled. You can find your backups in your ⚙️ Structured Settings in the General section when tapping on Advanced.