Smaug certainly looked 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 ray of red from under the drooping lid of Smaug's left eye. He was only pretending to sleep! He was watching the tunnel entrance!
. . . she woke up in time to see the sun sending up spies ahead of him to mark out the road through the dark. He peeped up over the door sill of the world and made a little foolishness with red.