Night shift settings not showing up on iPhone 6 Plus?

I used to have it like when I first got the phone but for some reason it's not in the settings anymore I'm on iOS 9.3 I haven't updated to iOS 9.3.1 yet but I don't want to. I would really like to know what's going on with my night shift please help

Make sure it is downloaded, Happened to me, I had to back it up to iCloud since my device hasn't been backed up for 72 weeks, it didn't allow me to download.

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Settings > Display & Brightness > Night shift

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