Sensei, you're clearly tired, so continuing like this is just going to make you less efficient.

Are you sure you don't want to take a nap with me?

Sensei is doing his best.

If you want to slack off, do it somewhere we can't see. Quit getting in our way.

All I'm doing is inviting our tired Sensei.

You can carry right on doing as much work as you want.

While we're napping, that is.