Chapter 1: An introduction to the field of breathing, circulation, and sleep: Why is Sleep So Important? The Prevalence of Disturbed Sleep. what is Sleep Apnea, and why Should We Care About it? -- Chapter 2: A brief history of breathing and sleep medicine: Where It All Began: The Ancient World and the Middle Ages. The Renaissance of Breathing Medicine: 15th-18th Centuries. Late 19th to the Late 20th Century. Late 20th Century to the Modern Day. To Conclude... -- Chapter 3: Description of obstructive sleep apnea: its nature and diagnosis: Types of Sleep Apnea. The Anatomy of Obstructive Sleep Apnea. Risk Factors for Obstructive Sleep Apnea. The Diagnosis of Obstructive Sleep Apnea. More About the Polysomnography. Conclusion -- Chapter 4: The non-surgical management of OSAS -- Chapter 5: the surgical management of OSAS -- Chapter 6 : appendix: links to further information.