We have a funny saying in English: sleep like a log.
A log does not move. It just lays on the ground.
If we sleep without moving, we sometimes say, “I slept like a log!”
Last night I was very tired. My futon was very comfortable. I slept all night. I didn’t wake up at all.
Indeed, I slept like a log.
How did you sleep last night? Were you comfortable? Did you sleep like a log?