有人在睡觉时，会出现一种睡眠障碍：睡眠处于半睡半醒的状况，同时还出现各种各样的幻觉，甚至还能听见周围的声音，但奇怪的是，无论自己再怎样用力，却都使不上力来，想大叫也叫不出声，想睁开眼或翻身起床，却一动也不能动。拼命挣扎数分钟后，才终于醒来，人会觉得全身很累，有时甚至满身大汗。
这种感觉使睡眠瘫痪症在世界各地的民间传说中有了位置。
Thatsensation has given sleep paralysis a place in folklore worldwide.
睡眠瘫痪症很常见，20%到60%的人可能曾经经历过。
Sleep Paralysis is common and may be experienced by 20% to 60% of people.
睡眠瘫痪症通常发生在晚间刚入睡时，或者凌晨正要苏醒时。
Sleep paralysis episodes typically occur either early in the night, as someone is falling asleep, or towards the end of the night, as someone is waking up.
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