Night fighting and sight ranges

Not sure if it would be manageable but including the time of day into combat and sight range would be cool. Once the sun goes down, sighting range, and combat efficiency drops for most units, except for special units, say commandos and engineers [which would be cool to have btw]. Subs would have bonuses to attack and defense at night as well. Air missions would be less accurate. Just something that popped into my head in my last game.