We put a note over the doorbell that says, "Baby sleeping" so thanks for not ringing the doorbell. However knocking isn't really better as we have dogs who make a lot of noise when they think someone wants in the house. Also when we don't answer the door knocking again is not likely to get a pleasant response. So please don't be surprised that I don't want to buy any of your magazines and all I say to you is, "BABY SLEEPING!" as I point to the note mentioned above.