Allow certain contacts to ring when phone on silent/night mode?

My WinPhone had this feature to set my phone silent at fixed hours of the night, but whitelist certain contacts for calls/texts. I've recently switched to Android (OnePlus3) and while I'm sure this must be possible (iOS does it too IIRC) I can't see what its called or where to configure it. Can someone tell me what these features are called on Android? My phone is running OxygenOS 3.2.8 atop of Android 6.0.1