Dental devices for the treatment of obstructive sleep apnea; Incontinence bed pads; Infant sleep positioner cushions for medical or therapeutic purposes, namely, for promoting an effective sleep; Medical device, namely, a device for measuring body position during sleep; Medical devices for treating sleep disorders; Medical apparatus for detecting rapid eye movement and other physiological conditions in a sleeping person indicative of dreaming and for inducing partial awakening so as to cause a state of lucid dreaming; Medical device, namely, a device for measuring leg movements during sleep; Water beds for medical purposes