Thanks, Artie. I did end up writing back and saying how the other times he hadn't replied in the morning he'd either been irritated with me or gave an explanation as to why he hadn't responded. So I was concerned he was bothered by the email. And he wrote back to say that he had a deadline that morning, so he didn't reply to any morning emails, that it had nothing to do with me.

Which helped some, but I'm still worried about session tomorrow.