Matt Perman from his blog on why checking email should not be the highlight of your day:

Let’s say that you are working in an office or room at your home. You realize that tomorrow is garbage day. So you empty your trash sitting beside you, go through the rest of the house and do the same, and then sit back down to work.

You jot some notes down on a piece of paper and decide you don’t need them. You throw the paper away, into the trash can you just emptied. Do you then empty the trash can again right away? Nobody would do that. You’d never get anything done. Instead, you let the trash collect, and then empty it again at a designated time.