Honestly Marnie, with DS it almost seemed like a fascination with the fact that he COULD. He's an incredible actor. But his sense of justice kicked in and the phase passed after a couple of months. I'll bet the same will happen for your son. he's just experiencing this weird sense of power.

Of course DS is still "too tired" to do unpleasant things. But I think that's just proxy for "I don't want to." I don't really take it as lying.

Hugs,
Sue