Ted's had just about enough time to sit back down next to Joan and grab his laptop when Sherlock knocks on the door. He glances down at Joan just to make sure she's properly covered (she looks very comfortably snuggled up). He did also make sure that her clothes weren't strewn around.

"Come on in," he answers, once he's established it's safe, hopefully quiet enough not to wake her, but loud enough for Sherlock to hear.