I've got a 24-year-old piano student that I'm usually pretty flexible with, schedule-wise.. He comes for lessons every Sunday, usually at 11 AM and sometimes at 3 PM depending on what is more convenient for the both of us. I've always felt pretty impressed at the rate he's been progressing, but during yesterday's lesson (3 PM) I noticed a huge difference in his performance. I suspect that early morning lessons are better, as the student is 'fresh..' Has anyone else had any experiences similar to this?