Do you often wake and feel unrested or have difficulty falling asleep each night? Quality sleep is important to help us function properly in our daily lives. During sleep each night, you are resetting your body and your mind. When you are not sleeping through the night, have difficulty falling asleep, or are not sleeping enough, you may start to see negative changes in your mood and your overall health. Some patients who have difficulty sleeping are suffering from a common sleep condition known as sleep apnea.