In addition to non-refreshing sleep, obstructive sleep apnea, characterized by pauses in breathing throughout the night, also presents danger in the form of oxygen deprivation. When you stop breathing, your brain does not get enough oxygen. Drastic problems can result from the oxygen deprivation of sleep apnea, including heart disease, high blood pressure, sexual dysfunction, and learning/memory problems. Many people who suffer from sleep apnea are not even aware that they have a problem. Most often it is a bed partner who is the first to be aware.