If you suffer from sleepless nights, feeling drained and groggy during the day, then you might be suffering from sleep apnea. This serious medical problem affects roughly 22 million Americans, though most cases go untreated. Sleep is critical for a body to function optimally, and lack of sleep can lead to a running list of other health issues. Sleep apnea disrupts the circadian rhythm, which in turn affects energy levels, moods, and relationships. The most noticeable and frequent symptom of sleep apnea is loud snoring.