I am a 'late at night' or 'early in the morning' writer. So I post in both time spans. I really don't think it has much to do WHEN you post as to WHAT you post and the search tags you give to your work.
If someone is following YOU, they will read whatever you write, whenever you post. But if someone is following a certain subject or category, and just uses search options each time they are on HP, it wouldn't matter when you posted it but it would matter what tags you assigned so that it would show up in their search. I haven't seen any statistics as to when the HIGH search times are on HP, so that might be an interesting tidbit to learn - might help writers decide optimal times to post.
With all that said, I have found in my experience anything I post from late Friday night until late Sunday night has less views and comments than the Monday to Friday readers (probably reading at work! LOL). Makes for a long weekend when you are looking for feedback.
Just my own opinion and personal experience with HP.