I've been to many Sports Cars night races, and I think it's fine. But I can't imagine F1 racing at night. They are much much faster than anything currently racing at night.
I've never raced at night, but I raced during the sunset, where is the sun was actually down (invisible), but still light. It's my worst time of the day.
BTW in the summer I will be doing a 24 Hour race in the USA, so I will be able to get the feeling of night races