I think you can blame Thomas Edison for it, not long after he invented the light bulb, daytime racing began to disappear, or global weather change, or the suns proximity to the earth, or just about anything, hay fever, whatever, I always liked the day races, as well as the night races, maybe it's because there are too many race cars, and it takes too long, about anything can be blamed for something other than what is really the cause! Beats me, we used to do it a lot, just one of them things! Bob