Here's what rhymes with sleepiness.
Words that almost rhyme with sleepiness
easiness leakiness sleaziness dreariness greasiness breeziness cheekiness freesias sneakiness steeliness creakiness wheeziness previous uneasiness devious queasiness squeakiness tedious deviance prescience vitiates beastliness priestliness mediates deviants unwieldiness obedience homogeneous obsequious perfidious novitiates expedience ingredients disobedience expedients gastrocnemius inhomogeneous intermediates inexpedience