sleeping /ˈsliːpɪŋ/adjective 2noun 1forms 1phrases 3 adjective2 •not awake, with the eyes closed and the body at restWe found a sleeping child inside the church. •Used for sleep; used to produce sleep. noun1 •The state of being asleep, or an instance of this. formssleepings Phrases with sleeping let sleeping dogs lieTo leave things as they are; especially, to avoid restarting or rekindling an old argument; to leave disagreements in the past. sleeping giantSomeone or something with great, latent strength. sleeping policemanA speed bump.