Has There Been a Recent Alien Invasion?

The munchkins were in their "Quiet Time" this afternoon. The Archangel & The Princess were in their rooms while The Prophet stayed downstairs in the living room. This gives them a chance to be alone for a while each afternoon. They don't have to nap (although The Princess usually does at some point). They just have to be quiet for about an hour & a half.

Well, I went upstairs to put The Saint down in his crib. The Archangel was thumping around in his room, so I went down the hall to tell him to be quiet. I walked into the room & saw him scooting on his knees, pushing a box across the floor. What was he doing? He was cleaning up the room that he & The Prophet share - all by himself w/out even being asked to do it. I knelt down & gave him a big hug, thanking him (w/ tears in my eyes) for doing it w/out being asked. He even said that later, he might even help The Princess clean her room.

This is the second time this week that he's cleaned w/out being asked. A few nights ago, he & The Princess worked on the basement (more him than her). Now, I know a lot of children do extra good deeds at this time of year, persuaded by Santa's visit. We, however, do not use that tactic because I don't think it's fair.

So, to the question in my title - has an alien taken over my munchkin? And if so, how long is he staying?