I've floated out of my body before into the living room where my friend's were sleeping (long ago), I hovered near the window for sometime deciding if I should leave or not, looking at myself sleeping in my bed. It was raining when I went to sleep, the sun began to shine when I was out of my body. I decided to lay back down into my body on my bed instead of exiting my one window that was slightly open.
I know it was true cos when I awoke it was not raining, and the sun was shining like when I was out of body. I also walked into the living room and all my friends sleeping in sleeping bags on the floor that I saw in my out of body experience were all in the same positions. And, I wouldn't have known this before i went to bed as they were still awake and standing when I went to sleep.
I would love to do it again, although scared I might leave this time… not sure what I would do, would like to fly. Anyways, good question… and not sure how to without dsm or some dissociative but that's not healthy.