10 Medical instruments for polysomnography, namely, medical devices used for the acquisition of physiological data for polysomnography; medical instruments for analyzing sleep state, namely, a device for measuring body position during sleep; medical apparatus for the treatment of snoring, namely, therapeutic mouthpieces for the prevention of snoring, and medical devices for treating sleep apnea; medical apparatus for testing sleep state, namely, medical apparatus for detecting rapid eye movement and other physiological conditions in a sleeping person indicative of dreaming; sleep state analyzer for medical purposes, namely, a device for measuring body position during sleep; therapeutic nose clips and mouthpieces for the prevention of snoring; medical devices for treating sleep disorders; therapeutic apparatus in the nature of mouthpieces for use in the prevention of snoring; medical apparatus for the treatment of breathing difficulties, namely, apparatus for use in the treatment of breathing disorders as well as structural parts therefor