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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.
Recurrent conditions like Kleine-Levin syndrome, which is characterized by at least yearly bouts of excessive sleepââ (at least 11 hours a day and up to days at a time) that are accompanied by debilitating mood and behavior changes, are also a type of primary hypersomnia. In other words, the cause is unknown.