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Adjective: slumbrous  slúm-b(u-)rus
  1. Inclined to or marked by drowsiness
    "slumbrous eyes";
    - slumberous, slumbery [archaic], somnolent
     
  2. Quiet and tranquil
    "a slumbrous June morning";
    - slumberous

See also: asleep, relaxing, reposeful, restful, sleeping