Actually, yes. But I am not in a formal relationship, so I can imagine this to be harder to arrange when you live together on a regular schedule.

But I would certainly try to do this in this situation as well.

It is not only privacy btw. it is also just nice to have both persons here in the now and not half distracted because the Smartphone just got new messages. Could be important... but usually never is important enough, to destroy the moment.

So when I go to sleep, alone or not, the mobile is off (without battery) or away. Unless there might be a emergency and I need to be avaiable, but those situations are rare.