This is a monograph of Ted Spagna, who bridged the gap between art and science with his pioneering visual studies of human sleep behaviour. In 1975, Ted Spagna began his voyeuristic investigation of the hidden landscape of sleep and dreams by photographing people with a time-lapse camera as they slept. Spanga's work is important for both its aesthetic and scientific implications. His images provided researchers with never before seen visual information about sleeping subjects, thus confirming and amplifying scientific studies about sleep behaviour.