Obstructive sleep apnoea (OSA) is a sleep disorder.The sufferer frequently stops breathing (apnoea) or has instances of shallow or infrequent breathing during their sleep (hypopnea).Breathing can repeatedly stop for ten seconds and longer in extreme cases.People with OSA experience repeated episodes of apnoea and hypopnea during the night.The lack of oxygen causes the person to come out of deep sleep and into a lighter sleep or wakefulness period to restore breathing.In one single night, sufferers may experience up to 350 apnoeic events.Repeated interruptions can leave a person feeling very tired during the day.OSA is classified minor or major depending on symptoms and response to treatment, impact on personal, work or social life and number of episodes of apnoea’s per hourThe most common sleep disorders I see in clients applying for life insurance are:Obstructive Sleep Apnoea (OSA)InsomniaNarcolepsyLet’s go through each one in turn.