It was a known fact to everyone that Sherlock Holmes' sleeping habits were far from ordinary. He barely ever slept, especially when he was on a case, and even when he did sleep it usually was for no more than a few hours. John Watson, a lot of the time, found himself questioning how Sherlock could go so long without even a nap. Running around London - and sometimes even other cities - trying to catch and reprimand criminals and constantly following the new clues and leads that the detective would find was quite exhausting if you asked John. This particular case keep them up until well past four in the morning. Sure, the case was solved, the criminal was apprehended and brought to justice, all of that was fine and dandy, but all the doctor wanted to do was to sleep.
When Sherlock and John soon returned to their flat at Baker Street, John could tell that his friend was more tired than he'd admit, even if he did try to hide it. On the cab ride back home, John noticed that Sherlock'