(EDS), or prolonged nighttime sleep, which has occurred for at least 3 months prior to diagnosis.

Sleep drunkenness is also a symptom found in hypersomniac patients. It is a difficulty transitioning from sleep to wake. Individuals experiencing sleep drunkenness report waking with confusion, disorientation, slowness and repeated returns to sleep.

It also appears in non-hypersomniac persons, for example after a night of insufficient sleep. Fatigue and consumption of alcohol or hypnotics can cause sleep drunkenness as well. It is

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