Learn what "he's sleeping like a log upstairs" means, when people say it, and how to use it naturally in English.

It means he is sleeping very deeply.
From An Affair With My Boss, Episode 45
Someone says a man is asleep upstairs and very hard to wake up.
Use this as a common casual description of deep sleep. It is normal in conversation, though the exact line is context-specific because of the upstairs detail.
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