If you use Apple iOS mobile devices, then there is an App called Soro that can do these things, but there is a bit of learning curve to use the software, which is basically a plugin for the iOS ‘shortcuts’ App and acts on Sonos speakers using the Sonos API - it can setup groups, room-volumes and schedule those to play a playlist etc. to a chosen daily schedule.
I’m not associated to the Soro App, other than I use it myself, but it maybe worth you exploring that further to achieve these things.
Also note, that what you are requesting here, can be done via the Sonos App too, but it may mean setting up the group and/or chosen room volumes each night before ‘lights out’… so you may perhaps find it easier to automate and schedule these things via Soro instead.
Hope that suggestion helps. Also see this link:
Thank you --- Hope Sonos is listening and will consider this a #featurerequest
Have you tried using the volume limit option on the One? This applies a scaling factor to the main volume setting. It can be useful in groups.