Erwin and Levi were abruptly woken up, by you-- early Christmas morning. Around 5am-6am, at the most.

Reluctantly, they followed you to the common room and helped decorate, aiding in putting the Christmas tree up.

You three were now exhausted after the bright and premature work you put in, and you finally got a chance to rest and bask in the presence of both men, without any younger scouts awake to disturb the peace.