I’ve written a lot about sleep apnea. It’s one of the most common sleep disorders, and one of the most dangerous. Just a quick recap: sleep apnea is a potentially fatal condition that causes pauses in breathing during sleep, sometimes hundreds of times throughout the night. These periods of oxygen deprivation can raise a person’s risk for high blood pressure, heart attack, stroke, and obesity. The precipitous and repeated drops in blood oxygen are what damage the body’s delicate tissues. Sleep apnea also results in a diminished quality of sleep. Poor sleep is related to a whole host of conditions, from anxiety and depression, to poor intellectual performance, to collapsing relationships. One of the things that’s so upsetting about sleep apnea is that it can be successfully treated, eliminating all of these frightening side effects. And yet, few sufferers even know they are suffering. If you live alone or your partner is a heavy sleeper, you may have sleep apnea and be entirely unaware. Even more frightening: new research shows that women are at particularly high risk.