[BullDog108]

I just updated my iPhone and am trying to figure out this new night lighting feature.

[Loud Mime]

http://www.forbes.com/sites/gordonkelly/2016/03/21/apple-ios-9-3-should-you-upgrade/#2a9f8f922048

[AFreeBird]

Swipe up from bottom of phone. The icon that looks like a crecent moon in the sun.

You have a manual option, or a scheduled one. You can also do it from settings: display &a brightness.

Works great.