According to police, the assault happened around 3:45 a.m. June 12 on Manitou Avenue - just off the Boise State campus.
The victim said in her statement before the police that she awoke in her bed and was shocked to see that a man who she did not know was sexually assaulting her.
The woman added that the man ran away when she woke up.
The sketch of the sexual assault suspect was released on Wednesday. The victim failed to accurately describe the man's eyes because he kept them covered.
A sketch of the suspect was released by the police on Wednesday. Police described the suspect as white and around 40-45 years old.
He's about 5 feet 8 inches to 5 feet 10 inches tall and has a pockmarked and/or acne-scarred face. The man was sporting dark clothes.