It make sense to do that and also to inspect your yard before a mow.
I would have thought that night is a prime time for automatic mowing, as there is less energy demand, but a timer on the mower charging station can solve that.
I was also originally thinking that people at night to reduce smog, but that is an issue more attributed to gas mowers.
I was going to argue that it would not matter since the robot is mowing, but mowing at the beginning of the evening would mean a whole night before you have to deal with it.
One could set it for when they leave for work.