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Causes of Hypersomnia. Hypersomnia has many and varied causes, including sleep apnea, narcolepsy, excess weight, drug or alcohol abuse, brain tumor and certain medications. Following is a list of causes or underlying conditions (see also Misdiagnosis of underlying causes of Hypersomnia) that could possibly cause Hypersomnia includes: 1  Sleep deprivation. 2  Clinical depression.  Schizophrenia.
The only symptom is excessive fatigue. Secondary hypersomnia is caused by other medical conditions. These can include sleep apnea, Parkinson's disease, kidney failure, and chronic fatigue syndrome, as well as others.These conditions cause poor sleep at night, so patients feel tired during the day.ypersomnia is a condition that causes a patient to feel sleepy throughout the day. It may occur even after long stretches of sleep time. It can be a primary condition or a secondary condition.