My son John goes to bed properly dressed, with one stocking on and one stocking off. It's a gently teasing rhyme about a boy too sleepy, or too stubborn, to finish getting undressed.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Diddle diddle dumpling, my son John
Went to bed with his breeches on,
One stocking off, and one stocking on;
Diddle diddle dumpling, my son John.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition