Apple has released iOS 9.3. It adds new features for the Health, Wallet, Notes, and Settings apps; the ability for students to share iPads; an enhanced Managed Apple ID function; and new 3D Touch shortcuts.
iOS 9.3 also adds a new feature called Night Shift, which is is designed to cut down on the amount of blue light an iOS device is putting out during the evening hours. To upgrade, plug your device in to power and connect to the Internet with Wi-Fi. Tap Settings > General > Software Update. Tap Download and Install. If a message asks to temporarily remove apps because iOS needs more space for the update, tap Continue or Cancel.