Hello Its_alarming567,
Thanks for reaching out to Apple Support Communities. Upon review of your post, it seems that you need to know how to locate the Bedtime feature on your iPhone 11. We can see why you’d want this taken care of, so let us help from here! Let’s start by reviewing this helpful article that was linked to your posting: Use Bedtime to track your sleep on your iPhone. Were you able to go through these steps?
Just as an FYI, the article explains: “The Bedtime feature is available only on iOS 13 or earlier. If you're using iOS 14, learn how to track your sleep on Apple Watch and use Sleep on iPhone.” In iOS 14 and beyond, the Bedtime feature is going in the Health app, not the Clock app as with earlier versions.
Please let us know if you have follow up questions, so we can continue assisting. Take care!