Use Night Shift on your iPhone, iPad, and iPod touch - Apple Support

Turn your Sleep Focus on or off on iPhone - Apple Support

The History of iOS, from Version 1.0 to 17.0

Use Night Shift on your iPhone, iPad, and iPod touch . . .

If you see an iPhone or iPad unavailable message or Security Lockout screen – Apple Support (UK)

Update your iPhone or iPad - Apple Support (CA)

How to enable and schedule Night Shift on iPhone - iGeeksBlog

Use and customize Control Center on iPhone - Apple Support

Use Guided Access on iPhone - Apple Support

How to use Apple's iOS Night Shift mode