Obstructive sleep apnoea is a serious respiratory condition that causes sufferers to repeatedly stop breathing while they are asleep, usually due to obstruction of the airway. The main symptoms include loud snoring, making choking noises while you sleep, or feeling very tired during the day. It can affect people of any age or gender. Lifestyle factors such as smoking, being overweight, and a lack of exercise can all increase the risk of sleep apnoea. Sleep apnoea can have serious health implications if left untreated, so you should contact your doctor if you are concerned.