At night, when they combine all the approach and departure frequencies together, they use 125.0 as their main frequency. My recommendation, at least on the departure radios, would be to have 125.0 available on all of them so that even if you are on a departure freq that normally wouldn't have 125.0, you don't have to move to another feed at night.
this may seem confusing, but i can explain better if you wish.