The Eye of the Dragon
“Smaug certainly looked fast asleep, almost dead and dark, with scarcely a snore more than a whiff of unseen steam, when Bilbo peeped once more from the entrance. He was just about to step out onto the floor when he caught a sudden thin and piercing ray of red from under the dropping lid of smaug´s left eye. He was only pretending to sleep! he was watching the tunnel entrance!”
The Hobbit, Chapter 12.
