I was just informed that on Saturday nights/technically Sunday mornings, while I'm asleep, Henry has a tendency to "leave the room and walk around the first floor and hang out by the vending machines". 

She apparently does this so often that, when she called me just now to tell me she wouldn't be home tonight, she wanted me to pass this information on to anyone who asked, since she figured people would wonder where she was if she didn't show up there one night. ...So this must be, like, routine for her. @_@

Which is especially weird given the comment earlier about how much she freaked out at the thought of someone seeing her in her pajamas... Not sure why that doesn't apply to her Saturday night 2 AM friends. ...Unless she changes out of her PJ's and into daytime clothes during this time, which would be even stranger.