There are numerous synonyms for the phrase "lulls to sleep," and any of them could be used to express similar meanings. Some common synonyms include soothes to sleep, sends to slumber, rocks to rest, calms into dreamland, and tucks into the land of nod. Other synonyms that could be used include cradles to slumber, eases into a peaceful state, pacifies to sleep, serenades into rest, and quiets into a gentle slumber. Regardless of which synonym is chosen, the meaning conveyed is likely to be one of peacefulness, tranquility, and soothing relaxation that leads to comfortable and uninterrupted sleep.