The idiom "not sleep a wink" originates from the idea that sleep typically involves a series of eye movements under closed eyelids. When someone does not sleep a wink, it implies that they have been completely awake throughout the night without experiencing even the slightest bit of sleep. This expression has been used since the early 17th century and has become a common way to describe a night of restless or sleepless activity.

英語での「not sleep a wink」の定義と意味

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