I believe in many countries this to be a problem. Higher speed limits at night are possibly nice, since you can get faster to your location but just because there might be less people on the road it isn't any safer. Coming from a country close to Germany I can assure you that driving at unlimited speed limit roads requires some time and training to get used to as you reflexes and stuff need to adept. At night when the vision is bad this can get very tricky.
Having also spent some time driving in foreign countries I can not imagine the mess with higher speed limits at night in countries like England, Italy, USA, Spain and so on where people already drive like shit.