When I got Cali I put step up beside the bed thinking one day she would be able to use them to get up on the bed if she ever wanted to. She slept in a playpen next to the bed.
The 3rd night I had her I was in the bathroom brushing my teeth and when I came out she was up on my pillow on the bed looking at me like "I'm sleeping here, where are you sleeping?". That was it