22-year-old David White, of Nashville, Tennessee, admitted to police that he was playing with his gun inside his bedroom when he unintentionally discharged the weapon.
The bullet went through the ceiling of the apartment below White and struck a woman who was sleeping in her bed. The woman's husband told reporters that he woke to his wife screaming.
The bullet hit her below her left shoulder and went into her chest. She was taken to the hospital for treatment. Doctors plan to leave the bullet in her for now.
White was arrested and charged with reckless endangerment.