sleep like a log

Idioms  

1. Also, sleep like a top. Sleep very soundly, as in I slept like a log, or She said she slept like a top. Both of these similes transfer the immobility of an object to that of a person who is sound asleep (since a top spinning quickly looks immobile). The first dates from the late 1600s; the variant is newer.

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Example Sentences

"Why, after all he went through today, he'll sleep like a log till mornin'."

From The Guns of Shiloh A Story of the Great Western Campaign by Altsheler, Joseph A. (Joseph Alexander)

"He'll sleep like a log until morning," Miss Emory reassured me.

From The Killer by White, Stewart Edward

He would have given almost anything to throw himself at full length upon the dewy deck and sleep like a log, even for a couple of hours, but such a privilege was denied him.

From With Beatty off Jutland A Romance of the Great Sea Fight by Westerman, Percy F. (Percy Francis)

He’s the only one of us didn’t sleep like a log.

From Dorothy on a House Boat by Raymond, Evelyn

So it might under ordinary circumstances, but unusual fatigue made him sleep like a log.

From The Young Miner or Tom Nelson in California by Alger, Horatio