Emergency alerts: is there any way to silence the "severe threat alerts" and "Amber Alerts" while I'm sleeping?

There are some emergency alerts I would be very grateful to receive even when I'm sleeping, but so far I've only receive alerts for things that didn't actually put me in danger or for things that I could literally do nothing to help with until I woke up the next day. I would like the emergency broadcasts to be silenced at night, specifically the ones in the categories "Show severe threats" and "Show AMBER alerts." I would still like to receive these alerts (so I can do something about them in the morning if I need to), just without any sound, and just for the period while I'm sleeping. Additionally, I would prefer to still have "Show extreme threats" and "Presidential alerts" sound at night if it is possible. I know this is a fairly specific order and in all my searching on this subject I have found no way to silence the emergency alerts without unsubscribing from them altogether, so I don't know if this is currently possible. But that's why I came here, to ask if there's something I've missed so far. Please note: I am talking about the emergency broadcasts you access through "Settings," rather than the feature available in "Google Now" I've seen floating around this website. Phone info: model: Moto G Android version: 5.0.2