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type 1 narcolepsy [T1N]

type 1 narcolepsy [T1N]

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The International Classification of Sleep Disorders, third edition, divides narcolepsy into Type 1 and Type 2 (the previous edition included narcolepsy with and without cataplexy). The new criteria for T1N require a combination of hypersomnolence and either low hypocretin levels in the cerebrospinal fluid or cataplexy plus short average sleep latency (≤ 8 minutes) and 2 or more sleep-onset REM periods (SOREMPs) on the Multiple Sleep Latency Test (MSLT). A SOREMP (within 15 minutes) of sleep onset on polysomnography may replace one of the SOREMPs on the MSLT.

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