The first time they floated through the ceiling, Abbie Kirkland was naked. Life was full of constraints, obligations and restrictions—sleep was one chance to abandon all of that. Even in the winter months, she hated sleeping in her clothes. Quilts were piled up on the bed, but she and Derek floated right up through them, their skin lit up blue under in a wide circle of light. Derek wore only a ratty t-shirt, the armpits gaping holes. The clock read 3:00 AM...