Literature meaning of <GOOD NIGHT>?

Question

Literature meaning of <GOOD NIGHT>?

Answer 1

There is no particular literary meaning. The most famous literary  goodnight is in Romeo and Juliet..

Good night is just a wish that you sleep well and undisturbed. Good morrow was a wish for a good day tomorrow.

thefreedictionary.com definition is:

good night  interj      an expression of farewell used in the evening or at night

Answer 2

Could be that it is the form of saying &quot;have a good night&#039;s sleep&quot;

At dictionary.com it say &quot;an expression of farewell used in parting at nighttime or when going to sleep&quot;