Corbin Davenport for Android Police:
Google created a preview program for the Google Home back in August, allowing users to test upcoming features. A new option has appeared for Homes on the preview - Night Mode. With this, you can set a time span (and even specific days) for the Home to reduce its volume automatically and dim the speaker’s lights. In addition, you can also enable a new Do Not Disturb mode, which blocks sounds from reminders and other broadcasted messages. Alarms and timers will still be heard when DnD is turned on, just like on Android.
This is great, and the volume lowering addresses one of the feature requests I wrote about in a terribly-titled article a few months ago. Hopefully similar options come to Alexa and especially Siri, since HomePod is launching this December.