The landlady had become so accustomed to my late habits that my place had not been laid nor my coffee prepared. With the unreasonable petulance of mankind I rang the bell and gave a curt intimation that I was ready.
This is amazing. Not only does Watson poke at himself in this very honest, and very aware, way, but there is so much that went right over my teen self. Like the fact that he was spending without care, being very lazy, slept a lot, and "suffered from nerves". He was PTSD'd to all hell. And without right out saying it, future him knows that he wasn't OK, and maybe also that the way Holmes induced his curiosity might have given him the jolt to snap out of the spiral-down.