Understanding Sleep Disorders is a beautifully illustrated chart that will help explain to your patients common sleep disorders. defines sleep,the sleep-wake cycle and explains why the body needs sleep describes the role of the suprachiasmatic nucleus (SCN) of the brain in sleep and wake regulation. includes a graph showing normal sleep pattern and describes the five stages of sleep covers common sleep disorders such as insomnia, obstructive sleep apnea, restless legs syndrome (RLS), and narcolepsy tips for a good night's sleep are also included. Made in USA Available in the following versions: 20" x 26" heavy weight paper laminated with grommets at top corners ISBN 9781587799204 20" x 26" heavy weight paper ISBN 9781587799198