Sleep-tight Definition
phrase
If you keep yourself tightly bundled you will sleep warm and rest well.
Wiktionary
interjection
(nightly farewell) Good night.
Wiktionary
Origin of Sleep-tight
There are many meanings of the word 'tight' and, unsurprisingly, there are several theories going the rounds as to the origin of 'sleep tight'. One is that the phrase dates from the days when mattresses were supported by ropes which needed to be pulled tight to provide a well-sprung bed.
From Wiktionary
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