08/31/2026
Let's bust another myth this Monday!
The phrase "sleep tight" refers to making sure the ropes of your bed are tightened, thus ensuring a restful sleep.
This a delightful phrase but is unfortunately not historically correct.
The word "tight" actually comes from the 16th - 17th century meaning "soundly" or "securely". When it is combined with the word "sleep", it means to sleep soundly or sleep well. It is similar to the phrase "sit tight". You don't tighten a chair, but you sit securely upon it.
The first mention of the phrase "sleep tight" was in a poem from 1866, after the use of rope beds, thus making the phrase irrelevant to a rope strung bed.
Today we use the phrase "sleep tight" in the accurate sense by wishing someone to have a good night's sleep.