Restricted airflow in the back of the mouth during sleep causes snoring. Sleep apnoea is a disorder associated with snoring where the airflow may be completely blocked for few seconds to more than 10 seconds. It can be mild with only 5 events per hour to severe with more than 25 episodes occurring every hour. People with sleep apnoea will usually feel day time tiredness, negative mood, lack of concentration from mild sleep apnoea to developing risks of stroke, diabetes and hypertension in severe sleep apnoea. It is diagnosed by the sleep clinics in the hospitals, where the patients will sleep overnight with special aids to monitor various markers during sleep. Oral appliances for sleep apnoea are useful to effectively manage patients with mild to moderate sleep apnoea.
