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Sleep like a log/baby

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Deep Uninterrupted SleepPlay
The phrase emphasizes undisturbed sleep with no signs of restlessness, just like a log SlideHe slept like a log, not even the thunderstorm woke him up.
LampPro Tip 2/3
Physical ExhaustionPlay
Often used after physical exertion, suggesting that the sleep is a result of being very tired. SlideAfter the marathon, I slept like a log.
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Informal ExpressionPlay
This idiom is casual and usually used in informal conversations or writing. SlideSorry for not answering my phone, I slept like a log last night.