2 (spy) espía emplazado en un objetivo, pero sin misión concreta o que aún no es operativo to be a heavy/light sleeper tener el sueño pesado/ligero; to be a good/poor sleeper dormir bien/mal
He was never a good sleeper. He was always under pressure One way of improving the quality of sleep for poor sleepers is to restrict the time available for it
5 (US) (for baby) pijama (m) de niño ...a movie which he had been assured would be the sleeper of the festival ...a young Dutch writer who had his first success with the sleeper "The Children's Crusade"