somnologist
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sleep — I (New American Roget s College Thesaurus) n. slumber, somnolence, nap, doze, drowse, rest, repose; coma; hypnosis. v. i. slumber, repose, doze, nap; be dead or dormant. II (Roget s IV) n. Syn. slumber, doze, nap, rest, repose, sound sleep, deep… … English dictionary for students
