[bennelson]

The little dark knob on the bottom of the top half is one the OUTSIDE (hallway side) of the door.

It's a pull knob so that adults can pull the door shut from the outside when the bottom half is already closed.

On the INSIDE of the door is the latch that ties both halves together. I took a look at adding it to the outside of the door, but the latch was only designed to work one direction, and would have been difficult to reverse.

So far, at night, we leave the bottom half of the door completely closed. It locks from the outside, but that hasn't been a big deal, as she's not very good at turning door knobs yet anyways. We leave the top half unlatched, but closed most of the way. That can let in a little light from the hallway, and it's very quite and easy to peek in by opening the top a bit and looking.