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What Does That Mean? Terms to know when talking about Narcolepsy - Wake Up Narcolepsy - Types of Narcolepsy - There are two types of Narcolepsy that share some symptoms, but are also different in many ways. Narcolepsy Type One (NT1) Also known as: Narcolepsy with Cataplexy - Caused by low levels of orexin/hypocretin in the brain, Narcolepsy Type Two (NT2) Also known as: Narcolepsy without Cataplexy - Normal orexin/hypocretin levels in the brain