As well as feeling excessively tired in the day time, even after a long sleep, and decreased intellectual function; the most common symptoms of sleep apnoea are:
Tired and sore muscles
Increased blood pressure
Waking up during the night to urinate more than once
In addition to these side effects of such a dysfunctional breathing pattern during sleep, the person with sleep apnoea is also prone to heart attacks, strokes, diabetes, impotence, and worsening dementia in the afflicted.