The unidentified man called police to report the mystery visit around 3:20 a.m. Saturday, the QMI Agency reported Tuesday.
The Victoria Police blog said the man reported "a woman came into his bedroom, promptly disrobed, slid into the bed next to him and fell asleep," the blog said.
When officers arrived, they found the woman still asleep and "quite intoxicated," the report said.
Looking for identification in a purse lying amid the pile of her clothes beside the bed, they determined she lived in the same building, but on another floor.
She was taken into custody to sober up, but not charged, the report said.
There was no indication why her key fit someone else's lock in the same building.