A Connecticut Yankee in King Arthurs Court by Mark Twain Chapter 36 Page 7

That was as far as I went, but the king was charmed and satisfied.

That evening we waited patiently for our fellow-slaves to get to sleep and signify it by the usual sign, for you must not take many chances on those poor fellows if you can avoid it. It is best to keep your own secrets. No doubt they fidgeted only about as usual, but it didn’t seem so to me. It seemed to me that they were going to be forever getting down to their regular snoring. As the time dragged on I got nervously afraid we shouldn’t have enough of it left for our needs; so I made several premature attempts, and merely delayed things by it; for I couldn’t seem to touch a padlock, there in the dark, without starting a rattle out of it which interrupted somebody’s sleep and made him turn over and wake some more of the gang.