A Seattle prosecutor has charged 26-year-old Chantae Gilman with second-degree rape after a man reportedly awoke from a deep sleep and found her on top of him in his bed.

The alleged sexual attack occurred more than a year ago, but a recently completed DNA test led prosecutors to file charges against Gilman, according to Q13 Fox.

The unidentified, 31-year-old man said he awoke at 2 a.m. on June 17, 2013 to Gilman straddling him and having sexual intercourse with him. Police say he told the 240-pound suspect to get off, but she allegedly refused and told him to be quiet. He was able to break free from underneath her and said he pushed her out of the apartment.

The victim said he'd gone to sleep following a night of partying and a "long day." He didn't know Gilman but recognized her as a "drug user in the area," a detective told The Seattle Post-Intelligencer.

Local hospital staff performed a sexual assault examination later in the day. The DNA collected during the case matched Gilman's this year.

Gilman told police that she didn't remember the incident or being in his home. She described herself as mentally ill.

Seattle police acknowledged to KOMO-TV that an arrest of a female rapist is unusual.

"From a statistical standpoint, yes, it is atypical to have a female aggressor," SPD Det. Drew Fowler told the station. "But we work to hold all people responsible for their actions. The law is specifically written to be gender-equitable and we will charge anybody with a crime that they've committed."

Gilman is a mother of four who is eight months pregnant with her fifth child, said Elwin Hartfield, a friend who answered the door at her last known address in Seattle. Hartfield said Gilman was in treatment in Eastern Washington, and that she'd been treated for mental health issues and drug abuse in the past.