Hypersomnia refers to excessive sleepiness and it is characterized by an individual having difficulty staying awake throughout the day.

People with hypersomnia can fall asleep at any time and in any condition, even while driving or at work. The primary symptoms of hypersomnia are prolonged nighttime sleep and excessive daytime sleepiness, with the desire to take several long naps during the day.

Sources: ASA American Sleep Association


Narcolepsy is a sleep disorder associated with profound excessive daytime sleepiness, sleep paralysis, cataplexy and sleep hallucinations. This uncontrollable sleepiness is more than just being a little tired, it feels as though you are tired ALL the time and not only is it difficult to stay awake, when you do sleep it is not a deep, satisfying experience

Sources: ASA American Sleep Association

Idiopathic Hypersomnia

Idiopathic hypersomnia (IH) is a sleep disorder in which a person feels excessive tiredness, even after a full and uninterrupted night of sleep. People with this condition may sleep longer than normal, sometimes 11 or more hours a night, yet still feel tired during the day.

Other potential symptoms of IH include non-restorative naps and feelings of grogginess after waking, called sleep inertia. Sleep inertia, sometimes also referred to as sleep drunkenness, can be severe in people suffering from IH. The transition from sleep to wakefulness can take up to several hours, leaving a person feeling mentally foggy and having difficulty engaging in even the most basic tasks—like getting out of bed.

In people with IH, hypersomnolence can happen at any time during the day or night. Excessive tiredness can cause significant challenges at work, school, and in personal relationships. Along with sleepiness, patients with IH may experience mood changes, slowed thinking and reaction times, and memory challenges.

Sources: Sleep Foundation

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