Hypersomnia: Involves feeling unusually tired

Hypersomnia involves feeling unusually tired. Learn about tests used to diagnose hypersomnia and tips for talking to your doctor about excessive sleepiness. Hypersomnia is a sleeping disorder categorised by excessive daytime sleepiness (EDS) despite getting adequate or prolonged sound sleep at night. Some people with this disorder may regularly sleep for 9 to 11 hours a day or more and still feel exhausted. Hypersomnia is a state of excessive sleepiness which can result in decreased functioning and affect performance adversely. Hypersomnolence is defined as an inability to stay awake and alert during major waking episodes, resulting in periods of irrepressible need for sleep or unintended lapses into drowsiness or sleep. Hypersomnia is excessive daytime sleepiness, and it has many possible causes. For example, it may occur with sleep conditions, such as narcolepsy, or develop after a head injury.