This happened a year or so ago.
Our master bedroom is on an upper level in our home and is some distance from corkys cage.
We put her to bed one night and covered her cage and we went to bed.
the next morning when I woke up I was on my back and as I looked down there was Corky perched on my foot. It was still dark and how she got there I do not know.
She had opened the food door on her new cage, climbed out (the cage was still covered) down to the floor of the great room. She had to have walked because it was still dark down 3 steps across the family room and up a flight of steps to the hall going to the bedroom, down the hall and than climbed on to the bed and perched on my foot.
This was a new cage because she kept getting out of her old one.