Sleep tight

DICTION-IT!

Sleep tight is a 19th century expression, which is often wrongly claimed to be a reference to the tightness of the strings used to support mattresses. 'Tight' merely means soundly/ properly, hence, sleep tight' just means sleep soundly. The word was possibly chosen because it rhymes with night, so people wished one another “good night, sleep tight, don't let the bedbugs bite".

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