A/N: 3am thoughts.
John Watson often wondered why Sherlock had made a habit of playing his violin at crazy times in the morning. At first, he thought it was another 'Sherlock thing' that went with the Mind-Palace and the deductions. After a while though, he gave up trying to get Sherlock to stop and just enjoyed it. Although, on a day without a case or after a day when Mycroft decided to drop in, it wasn't so enjoyable but it was better than putting holes in Mrs Hudson's wall with a gun.
So, he endured it. Sometimes he made a brew to go with it, sometimes he just sat there on the couch until he dropped off again (He still managed to wake up in his bed though...). He started to notice Sherlock's troubled face after a while of this routine of waking up to the sound of a violin and watching Sherlock.
A couple of nights ago, when it happened, he asked Sherlock why he looked troubled. He just got a confused face and an outright denial. He asked every other day but changed the question slightly, wanting an answer.
Tonight, he asked the right question, "Why don't you sleep?" But he didn't get exactly what he wanted, "I have too many thoughts." But he accepted it; he also decided to ask Mycroft.
Although, as usual, Mycroft wasn't helpful. He gave long answers that didn't include hardly any information. A very Mycroft answer, he supposed. But, if you combined the two answers, you got the real truth.
That's what John did (After 3 more cases in the same week) and got his answer. Sherlock was afraid to sleep because of his nightmares. John would have thought it was slightly childish but it was Sherlock. The man who could know everything but still know nothing. He guessed it was why Sherlock was very brash when speaking and a self-diagnosed Sociopath.
John knew Sherlock did sleep because he had once caught him passed out on the couch after a 5 day case. He also remembers that after that, Sherlock played for the longest time since John moved in.
So, nightmares. Everyone had them. Even the great Sherlock Holmes. The one thing John now wondered about was what scared Sherlock Holmes?
A/N: Thinking about making this a two-shot but I have no ideas. What does scare Sherlock Holmes? If you have an idea, PM me or write a review.