Yes, and which squadrons launched their entire compliment of daytime fighters and daytime heavy bombers to go to the enemy fields in the middle of the night, bomb them, land at them, have troops run into them, capture them, all at night?
Hrm... none.
Night flying was NOT undertaken by most units. The rare exception is night-time bombing, but that's an entirely different OFFLINE type of simulation game, not this game.
No, night flying is NOT realistic. Not in this game. Nor was it very common (millions+ sorties in fair weather only, as compared to specialized night bomber missions and almost no bad weather missions and no daytime fighter sweeps in the middle of the night)