"What do you want for Christmas?" John asked, blinking as he looked at Sherlock.
Sherlock didn't respond.
"I thought I could get you something weird, you know, like something to do with chemistry or something."
There was no response.
"Or I could get you a paid subscription to My Weekly, since you seem to like reading that so much."
John paused, drumming his fingers on the armrest.
"I could get you new books. I could get you clothes that actually fit."
Still, he received no response from Sherlock.
John wasn't surprised. Sherlock either ignored him or glared at him when he talked about Christmas. He didn't know why, exactly, but... Holidays were a time to be social and that didn't fit Sherlock at all.
"I know, you probably want a murder or something, but I can't do anything about that. Personally," he muttered, to himself, "I could do without a case on Christmas."
John looked back at Sherlock.
"Are you going to say anything at all or are you just going to let me talk to myself?"
Sherlock still didn't repond.
John blinked and stood, walking to the couch. He realized, then, that Sherlock's eyes were closed and his breathing even. Sleeping.
John shook his head, sighing as he covered Sherlock with the blanket.
Note: The fact that Sherlock doesn't have clothes that fit is somewhat obvious, but he also apparently does not know his clothes size. He also reads My Weekly. Information from Sherlock: The Casebook.