Originally Posted by
nik0tine
If he's four perhaps he's easily tricked? Tell him that a monster has moved in and that this monster brutally maims and/or kills children who yell too much. Tell him that if he wakes the monster he'll get his right leg eaten off and that nobody will be there to stop the monster because the monster is stronger than his parents. Get him to believe something like this, and try and use it to your advantage.
Yes, I realize that this is not a moral thing to do, but I don't think you care, do you?