Narcolepsy may have several different causes, including a deficiency in the neurotransmitter hypocretin, which helps keep you awake.

嗜睡可能有许多原因，比如下丘脑分泌素这种神经递质的缺乏，它可以维持清醒。

Type 1 is usually based on having low levels of hypocretin, a brain hormone that regulates sleep, or a person reporting cataplexy.

1 型通常是基于低水平的伪君子，一种调节睡眠的大脑激素， 或报告有猝倒症的人。

People with Type 2 usually don't experience the sudden loss of muscle tone, and they also generally have normal levels of hypocretin.

2 型患者通常不会出现肌张力突然下降的情况，而且他们的下垂素水平通常也处于正常水平。