This doesn't exactly address your question, but HN submissions generally come from other sources of news around the net. These generally drop off over the weeke

This doesn't exactly address your question, but HN submissions generally come from other sources of news around the net. These generally drop off over the weekend, so it is only natural that HN traffic does as well. I imagine that there are significantly fewer of us using this site over the weekend, but there is also less for us to talk about.