The oral cavity is the gateway to the rest of the body.Research continues to break new boundaries and the link between oral health and systemic illnesses. Collaboration of medical and dental professionals can play important role in improving patient's quality of life in the field of sleep disorders. These disorders often go unrecognized while attempting to resolve a patient's ongoing conditions.Oral diagnostician can help in early recognition of sleep disorder through the history,by recognizing the oral manifestations of snoring and sleep apnea and utilizing various investigative techniques like CBCT,CT,MRI to rule out various findings that might indicate the potential for sleep related disorders. This book is an effort to help readers understand concept of normal sleep and various roles of an oral diagnostician in diagnosis of sleep disorders.