Here are some possible explanations:
* Early 19th century: The earliest known documented use of "rise and shine" was in an 1819 book titled "The Life and Adventures of Nathaniel, a Dog of High Degree". This suggests it was already in common usage by that time.
* Military background: The phrase has a distinct military flavor, with "rise" referring to waking up and "shine" possibly referencing polishing weapons or equipment.
* Folklore and tradition: It could have originated from a common saying or proverb about the importance of being up and active early in the day.
Regardless of its exact origins, "rise and shine" has become a popular and enduring phrase in English, used to encourage someone to wake up and be cheerful.