It had been a long, exhausting day for the Doctor. Between the sirens and the sheer stress of being literally stuck in a place, keeping up his usual level of energy was starting to take it's toll by a tell tale look to his features. Usually bubbly and bouncy, even the Doctor was moving abit more slowly as the lack of rest caught up with him.
For the second time today he didn't hear someone coming when he ought to have. Earlier it was Jack who caught him with his pants down (figuratively, of course) in the carnival. Now it was Sam who had managed his way back into the museum - probably not entirely quietly who'd caught the Doctor with his mind wrapped up more in his work than in his surroundings.
Jerking his head up, his hair not actually moving from it's wild juxtaposed positioning the Doctor blinked a few times. It was sort of strange to have slept in the same place as a person and not actually held a conversation with them - and such was the case with the Doctor and Sam.
"Sonic modulator," he said in carefully measured syllables - a choppy, playful bit that sounded almost robotic. "With the help of Captain Jack, we might actually have the correct frequency - all that's left is to put it all together," he said, fingers moving not quite as deftly as he'd like.