Thanks for posting in the Apple Support Communities Patrick,
You can view your sleep data, and change how it's displayed, using the following steps:
1: Tap Browse at the bottom right, then tap Sleep.
2: Do any of the following:
• View sleep data by week or month: Tap a tab at the top of the screen.
• Change the time span displayed in the graph: Swipe the graph left or right.
• View the details for a day: Tap the column for the day.
• Manually add sleep data: Tap Add Data in the top-right corner of the screen.
• Get cumulative sleep data: Tap Show More Sleep Data.
Additional information is available, here: View your sleep history in Health on iPhone
These are the options currently available and posted from Apple. If you'd like to see additional options for features in the future, we recommend that you provide feedback for Apple, here: Apple - Product Feedback
Cheers!