The present disclosure relates to an N-(substituted naphthyl-ethyl) substituted amide compound and uses thereof serving as a melatonin receptor agonist and 5-HT2C receptor antagonist, and specifically relates to the compound of formula (I) or a pharmaceutically acceptable salt thereof, a solvate or a mixture of them, and a pharmaceutical composition, where X, R1, and R2 are as defined in the present text.