I have posed one, last, final, I-promise-this-is-the-end bedroom rhyme, titled Anna Crusis.
The Concise Oxford Dictionary of Literary Terms - my Bible in these matters - defines "anacrusis" as the "appearance of an additional unstressed syllable or syllables at the beginning of a verse line, before the regular metrical pattern begins." I wrote the verse just so I'd remember that. The rhymes and meter are based on "Jack and Jill."
Hope all that nonsense doesn't spoil the fun for you.