Why would he do that?!

It's nearly 1am and my daughter just woke up during the night for the first time in months. I go in and pick her up, I'm rocking her and she's starting to fall back to sleep. The monitor is still on so my husband can tell that she's not crying or fussing and hear me rocking her. This man freaking decides to walk in the room, floor creaking, my daughter immediately catches sight of him and is instantly wide awake. Getting her back to sleep just became his task😴