Then I realized it was coming form inside LittleBrother's room. DW came out and told me the story. She was on the internets and heard: thump. patter patter patter. She came out and looked at BigBrother's room, but the door was shut. She looked at LittleBrother's room and it was shut. Then she noticed LittleBrother was in our room poking his head out giggling. He had gotten out of bed, opened his door, left, shut his door and scrambled into our room in about 15 seconds.
She put him back in, and went to search for the safety door knob covers (so he can't open the door). Before she could get it together, she heard the thump and the patter again. It took her a few seconds to get upstairs. This time, he had gotten out, went to our room, and got back in his room before she got there. He was in his crib looking as innocent as could be.
She put the door knob on, and told him to stay in bed. I came in a few minutes after that. The twanging was LittleBrother playing with the doorstop. We ignored him until it stopped. Thinking he was back asleep, we left him to his own devices.
When we went upstairs to wake him up, we realized that in fact he wasn't asleep. He took every book he had in his room, and slid it under the door. About 40 of them.
So our options are:
- Ignore it and hope for the best
- Put a 'tent' over the crib
- Put him in a big boy bed
- Pad the room so he doesn't get hurt