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A 19‐h spontaneous sleep period in idiopathic central nervous system hypersomnia

Reports of prolonged sleep periods in idiopathic central nervous system hypersomnia, as shown by ad libitum sleep recordings, are rare. A patient with idiopathic hypersomnia with extremely long sleep periods and sleep drunkenness after awakening is described. Polysomnographic recordings showed a spontaneous sleep period of 19.4 h and a normal Multiple Sleep Latency Test. These polysomnographic findings are clearly abnormal but essentially different from those of narcolepsy. Unlike narcolepsy, ‘idiopathic hypersomnia’ does not seem to be a distinct clinical entity but a category for different heterogenous subtypes.