​The aunt of a 3-year-old boy who was found beaten to death​ and covered in bruises from a belt in his Brooklyn home ​has confessed to his killing, police sources told The Post.

Christen Dale, ​21, allegedly told police that she beat little Ethan Ali “because he wouldn’t go to sleep,” sources said.

​Dale was charged with manslaughter and endangering the welfare of a child at the 67th Precinct station house in Brownsville Thursday night.

Cops found Ethan lifeless and covered in bruises on Wednesday at 287 Rockaway Parkway in Brownsville after a 911 call.

Ethan’s mother had left him with Dale, sources said. Dale’s boyfriend was also at the apartment when cops arrived.

The city Medical Examiner’s Office ruled Ethan’s death a homicide on Thursday.

One police source said, “There appears to be a history of abuse against the boy.”