This Day or Tomorrow?

Conversation during tonight's bath:

Daniel: Are we going to Ms. Sarah's today?
Me: Not today. Today we're just taking a bath and then going to bed. We'll go to Ms. Sarah's tomorrow though because I have to work.
Daniel: This day?
Me: No, not this day. Tomorrow.
Daniel: Is tomorrow this day?
Me: No. Today all we have left to do is bath and then bed. Then we'll go to sleep, and then it will be tomorrow. And we'll go to Ms. Sarah's.
Daniel: We'll go to sleep and then go to Ms. Sarah's this day?
Me: Well, not this day. It will be tomorrow when we go to Ms. Sarah's.
Daniel: Is it tomorrow already?
Me: No. It's today. It becomes tomorrow while you're sleeping at night.
Daniel: So are we going to Ms. Sarah's this day or not?

This went on and on for awhile. Though he couldn't understand the difference between today and tomorrow, I think he finally figured out when he would be going to the sitter's! The questions this kid asks are incessant!