Yeah, that explains it. Now everything is crystal clear.
In related news... After I finished my conversation with DD, I went into the kids' bedroom to get their pajamas. When I turned on the light I saw someone sitting in the corner of DS's crib, looking somewhat like this:
To say that I got scared is to say nothing. I know the feeling lasted only a few seconds, if that, but that was enough to cause some heart palpitations. Pretty soon I realized what was actually sitting in DS's crib: a big stuffed Shrek, a gift from my dear parents, not some hard-core criminal hiding from justice.
We got to do something about our children's stuffed toys, they are causing too much commotion...