Idiopathic hypersomnia is an uncommon sleep disorder that causes you to be excessively sleepy during the day even after a good or prolonged night's sleep. It also often causes difficulty waking up after you've been asleep at night or for a nap. Naps generally aren't refreshing.
The need to sleep can strike at any time, including when you're driving a car or working, which makes idiopathic hypersomnia potentially dangerous.
The condition often develops over weeks to months. Diagnosing idiopathic hypersomnia requires ruling out more common sleep disorders. Treatment is aimed at controlling symptoms with medication.
To diagnose your condition, your doctor will review your symptoms, go over your family and medical history, including your medications, and conduct a physical examination. Your doctor might order several tests to diagnose your condition, determine the cause of your condition and rule out other conditions.
Because the cause of idiopathic hypersomnia isn't known, the treatment is aimed at easing symptoms. Stimulant medication, such as modafinil (Provigil), might be prescribed to help you stay awake during the day.
In addition, your doctor might recommend that you develop a regular nighttime sleep schedule and avoid alcohol and medications that can affect your sleep.
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