How Do You Install the Sleep App?

I do not have the Sleep app on my Apple Watch Series 6 watchOS 9 or iPhone 11 iOS16. It does not appear in my Apple Watch menu. It does not appear in my Watch app on my iPhone, and it does not appear under Health as a data source app. It literally does not appear anywhere that Apple Support documentation shows that it should appear. Have I somehow managed to uninstall it? How does one reinstall it?