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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.
Even the condition of obstructive sleep apnea can cause hypercapnia. Sometimes it can be caused due weakness in the skeletal muscles. If the person is kept exposed to higher levels of carbon dioxide for long time, it can trigger hypercapnia. This condition can also be caused due to initial inhalation of supplementary oxygen by a patient with underlying medical problems like sleep apnea.