Bedroom combines the ASL signs for bed and for box or room. You start by signing bed, bringing your two hands together with palms touching, and placing them by the side of your head as if they were a pillow. Then you sign box or room, by taking your two open hands palms facing each other and a few inches apart, and outlining the four sides of a room.
Bedroom usually refers to your baby's own bedroom when initially introduced. As your baby gets more advanced, you can start to add ownership to the bedroom and start signing Daddy's bedroom or Mommy's bedroom.
We love to teach this sign as soon as our babies begin sleeping in their own bedroom.