"No, she's still awake, or I wouldn't leave," he answers. He'd either text Sherlock, or just come to the door and ask him to come before he left.

She can fall asleep very quickly though. So he turns around and peeks in the door. "You hear that? No going to sleep without us," he says, pretending to be stern, but smiling playfully through it anyway. He doesn't want to be overbearing, but it's more about acknowledging his and Sherlock's hypervigilance.