I'm afraid not, it's just something I saw (or heard, can't quite remember) a while ago that stuck. Here's an article on the subject. Problem is that it's in Swedish... But in short, 30 percent of all accidents in Sweden is caused by tiredness/lack of sleep (driving while tired is punishable btw). It's a highly questionable study though (web questionarie made by an insurance company), so it's nothing to consider as more than ancedotal knowledge. It says nothing about what's considered an accident, for instance.
Übereil
Übereil