
Sleep like a log/baby
Deep Uninterrupted Sleep
The phrase emphasizes undisturbed sleep with no signs of restlessness, just like a log

He slept like a log, not even the thunderstorm woke him up.
Physical Exhaustion
Often used after physical exertion, suggesting that the sleep is a result of being very tired.

After the marathon, I slept like a log.
Informal Expression
This idiom is casual and usually used in informal conversations or writing.

Sorry for not answering my phone, I slept like a log last night.
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