A sleep aid machine includes a housing, a base mounted on a lower portion of the housing, a top cover mounted on an upper portion of the housing, a main control module mounted in the housing, and an electromagnetic module mounted in the housing. The electromagnetic module is electrically connected with the main controller of the main control module. Thus, the electromagnetic module transmits electromagnetic waves with a specified frequency, so as to release and comfort the user, thereby helping the user sleep easily and comfortably.