Hypersomnia associated with alveolar hypoventilation in myotonic dystrophy

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Abstract
Myotonic dystrophy was recently discovered in a 38-year-old man complaining of excessive daytime sleep for 18 years. Pulmonary function tests showed alveolar hypoventilation resulting from defective central respiratory control. Polysomnography revealed a low sleep apneic index insufficient to account for the hypersomnia. Sleep cycles were normal, without REM excess or REM onset. A similar membrane abnormality in muscle and brainstem neurons could account for the myotonia, hypersomnia, and alveolar hypoventilation.

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