Holmes is rapidly feeling the pull of sleep get tighter, which means he ought to situate himself on the bed, which means summoning up some effort. He takes a deep breath and lifts his head enough to brush a kiss across Watson's lips, and thus strengthened, he shifts sideways. Stretching out beside Watson, he wraps his arm across Watson's chest and presses close.

"That was a mutually beneficial competition," he murmurs contentedly, lightly kissing Watson's shoulder. "Mm, darling, you have worn me out. Shall we say good night?"