Hypersomnias: (hi per som nee ya)    [hyper = over or excessive, plus somnus =sleep]  An inability to attain wakefulness, despite adequate amounts of sleep. People with Hypersomnias are tired no matter how much they've slept. Very often, they cannot keep from falling asleep at inappropriate times. Like insomnias, hypersomnias may be transient,  acute, or chronic. Chronic hypersomnias require

Click on the links below for more information about specific Hypersomnia disorders:

Narcolepsy:  a hypersomnia characterized by excessive daytime sleepiness, sleep attacks, cataplexy, and hypnogagic hallucinations. ...more

Periodic Limb Movement Syndrome(PLMS):  repetitive movement of the limbs during sleep, which fragments sleep, making even a long rest unproductive! ...more

Insufficient Sleep Syndrome:  continual failure to get enough sleep, which leads to chronic, excessive daytime sleepiness. ...more

Additional Hypersomnias: 
any of several less common hypersomnias, including: Idiopathic Hypersomnia, Klein-Levin Syndrome, and Hypersomnia Due to a Medical Condition. ...more