Don't jump on me at 9 AM with a list of questions you have from the night before - I am going through e-mails and instant messages at that time. Wait half an hour, unless it is an emergency.
Like most people, I eat lunch at some point between noon and 1 PM. That's why my calendar is open, yours is as well, as are most people's. This is a bad time to start peppering me with questions.
Also, don't struggle on something all day and then at 4:45PM tell me you haven't made any progress and ask for help. Have this realization at 4 PM, or better yet 3:30PM or even 3:00PM. Sometimes a quick look by me at 3 PM can get you on the right path again.