In Reply to: Turn in posted by Kent on July 01, 2008 at 14:51:
: What is the origin of the phrase 'turn in'? As in..
: 'I am tired so I am going to turn in'
In the meaning of "go to bed," the Oxford English Dictionary describes this as a colloquial term of nautical origin. It appears to have been well-known in this sense in the 17th century, and from the 19th century the OED gives us this example:
1837 T. HOOK Jack Brag xiii, Jack 'turned in', as the sailors say.
Perhaps someone can say why sailors used the term.