Knock him out magically...

You calm yourself, he might prove useful later. You launch the same spell that knocked him out last time back down his throat. Again he coughs a bit before falling unconsious.

You lift him up with magic and start to truss him up. You cross his arms behind his back, fold up his legs and place them in a fetal position. You then place a lot of bonds on him to keep him in that position. Next you place some black stuffing in his mouth, it will render him mute. Then you cover his lips to make sure he doesn´t gnaw on anything.

After sitting him down in the closet you place a blindfold on him, then for fun you put some plugs into his ears. When he wakes up in the morning he´ll be mute, deaf, blind and completely immobilised.

You walk back to the bed after closing the closet again. Sliding in under the sheets, you snuggle up to his mother and drift back to sleep...