Light snoring can be just an annoyance, but heavy snoring may be a symptom of a serious sleep disorder called sleep apnea. People with Obstructive Sleep Apnea (OSA) stop breathing again and again during sleep. These events may occur several hundred times a night. The signs and symptoms of sleep apnea include loud irregular snoring, morning headaches, excessive daytime sleepiness, high blood pressure, and anxiety and depression.
People who are too sleepy during the day and feel muscular weakness when they are angry, surprised or amused may have narcolepsy. Sometimes narcoleptics experience terrifying dreams or hallucinations as they fall asleep. Narcolepsy often emerges in young adulthood and is a lifetime medical disorder.
People with Restless Leg Syndrome have an uncontrollable urge to move their legs when at rest. This can result in insomnia, difficulty sleeping and daytime sleepiness.
When the regular pattern of sleep is disrupted, some people have trouble finding a sleep/wake schedule that fits their needs. This may be caused by shift work or other changes in the schedule. Some complaints of insomnia or daytime sleepiness may be due to undiscovered changes in the sleep/wake rhythm.