hypnotic

(noun) a drug that induces sleep. Synonyms: soporific.

(adj) of or relating to hypnosis.

(adj) attracting and holding interest as if by a spell. Synonyms: mesmeric, mesmerizing, spellbinding. Examples: "Read the bedtime story in a hypnotic voice." "She had a warm mesmeric charm." "The sheer force of his presence was mesmerizing." "A spellbinding description of life in ancient rome."