微睡眠

微睡眠（英語：Microsleep）是指一小段维持几秒到半分钟不等的陷入睡眠或者睡意昏沉的时间，在此期间，人不对任何感官知觉有所反应而处于无意识状态。微睡眠主要表现为在一小会儿失去意识后重新清醒，或者在清醒和昏睡的状态之间快速切换。在行为学中，微睡眠的主要表征为眼帘下垂、睑闭迟缓、缓缓点头。在电生理层面，微睡眠被定义为腦電圖代表着清醒状态背景活动的8–13 Hz的α波（英语：alpha wave）活动为4–7 Hz的θ波（英语：theta wave）活动所取代。一些专家通过以上述的若干行为学指标来判断微睡眠状态，其余多以脑电图特征为鉴定依据。 尽管睡眠正常的人在重复单调工作时也可能会产生微睡眠，但微睡眠往往是睡眠不足的后果。微睡眠在例如开车、使用重型设备等需要高度警觉的环境下极其危险。人们经历微睡眠时往往意识不到自己的微睡眠状态，反倒以为自己一直专注工作或者只是觉得自己走了一会儿神。 微睡眠时，大脑和睡意相关的区域活跃度增加，和醒意相关的区域活跃度下降。但因为存在单调的工作也可以导致微睡眠较为复杂的神经调节，且每个人的大脑结构有所差异，故客观判断与微睡眠相关的神经活动较为困难。因此建立对照用实验组并进行对照检验极其重要。 一项对正常休息过的人同时透过眼视频测试、行为反应测试、脑电图、功能性核磁共振测试的实验中，20名参与者需要看着操纵杆在屏幕上以上下左右四个方向移动长达50分钟，动，过半数参与者在盯着操纵杆这一持续视觉运动任务时发生了脑电图意义上的微睡眠，同时负责保持醒意的丘脑、中腦、后扣带皮层活动减弱。 Chou (2011)的实验检测了五位受试者从微睡眠状态被刺激苏醒时的神经激活模式，发现视觉区、額葉區、边缘叶在收到直接刺激时的激活，以及前皮质、颞叶、主要運動皮質區、岛叶在醒后的激活，由此得出“思考判断能力滞后与苏醒后恢复，并有可能导致危险”的结论。 睡眠及睡意的产生由多种化学物质调节。多巴胺被认为促进了睡意，而腺苷被认为提升了醒意，共同参与微睡眠在内的睡眠调节。微睡眠状态下，腦橋─膝狀核─枕葉波（英语：PGO waves）) 加强，抑制了基底核的视觉处理。视觉处理通路被抑制后，负责释放多巴胺的上丘（英语：superior colliculus）细胞并不透过基底核的相同通路去抑制，导致了微睡眠发生和神经处理能力的下降。 微睡眠和许多疾病关联。睡眠呼吸暂停是最为流行的与微睡眠相关疾病，影响了1,000到1,500万人。其他关联疾病包括發作性嗜睡病、嗜睡症、精神分裂症等造成白天过度嗜睡的疾病（英语：excessive daytime sleepiness）。微睡眠片刻往往被患者忽视，不常作为临床诊断指标，多项睡眠测试常被用来侦测微睡眠。 由于反复出现的微睡眠常常会影响正常的日常生活，多数临床研究致力于利用药物手段减少微睡眠在内的日间过剩的睡意。莫达非尼在此方面几乎无副作用，故而在药物选择上十分流行；新药研发中往往会有和莫达非尼及安慰劑的效果比较。莫达非尼也有用来治疗或正被测试治疗精神分裂症、发作性昏睡、猝倒症、睡眠呼吸暂停。在莫达非尼扩大治疗对象和新药与之比较疗效的过程中，各类造成嗜睡疾病的药物干预手段的研究正在完善。 微睡眠有时是药物治疗的副作用，例如用于治疗帕金森病的多巴胺刺激药物，昏睡是普拉克索（英语：pramipexole）、羅匹尼羅等多巴胺抑制剂（英语：dopamine agonists）的负面作用之一。这些药物可以在50%开车中的帕金森病人中导致突然起效的睡意。因此临床研究也致力于减轻这种负面作用。 多数微睡眠在临床上并不显著。感到困倦的人往往喜欢去使用一项无需处方的刺激剂，例如含咖啡中的咖啡因。高频率的低剂量咖啡因的摄入在对延长清醒情况下保持注意力确实有效，因为咖啡因是腺苷的竞争性拮抗剂，实验也从而证实腺苷在保持清醒中的作用。其它刺激剂还包括阿得拉尔、苯丙胺、可卡因和烟草等。 侦测微睡眠的方法有很多，惟尚无对最优侦测和分类微睡眠方案的定论。简单的方式诸如心理測驗、语言测试、行为测试（如打哈欠测试和眼视频测试）；复杂的也有如软件辅助的脑电图、核磁共振、眼电图、多导睡眠图。多项测试可能可以使得诊断更为准确。 尽管有人试图透过主要是脑电图或者眼动测试来进行微睡眠总分类，现阶段仍然存在不同条件下侦测到的不同种类的微睡眠。Karolinska睡意量表之类的主观自述类型的心理测试尽管和脑电图被认为有正关联，但很难区别睡意的程度而存在局限性。未来的研究需要更加注重小而微的客观现象，例如更短间隔内的脑电波细节等，来揭示电活动和行为活动的关系，以获得更高的侦测准确率。如此，微睡眠可以自然而然地和不同的清醒状态区别出来。 在美国，单单疲劳驾驶一项每年就造成1,550死40,000伤，使得睡眠不足成为重要的公共安全议题。微睡眠主要表现为在一小会儿失去意识后重新清醒，或者在清醒和昏睡的状态之间快速切换。在行车途中，疲劳驾驶的司机会可能会经历无知觉的几秒钟，这便是微睡眠的具体例子。司机很难发现自己失去了的几秒钟，但微睡眠期间的驾驶却有极大造成交通事故的风险。 历史上，不少交通事故在微睡眠期间发生。微睡眠状态下的驾驶被指间接造成了2003年发生瀑布列车事故（英语：Waterfall train disaster）：火车司机心脏病发，而值班守卫却被监察者指在微睡眠状态，只是列车异常速度无法被正常响应。2009年的造成飞机坠毁大西洋的法國航空447號班機空難中，机长曾报告说：“我昨夜没睡够。只有一个小时，那不够。”遂甩手给两位副驾驶，后者未能在飞机遇到危险的时候合理处置，造成了事故。切尔诺贝利核事故中，反应堆开始过热的主要原因就是睡意昏沉的操作人员错误地关闭了制冷系统，最终导致了一系列事故发生。 因此，微睡眠常常在用来检测司机的睡意（英语：driver drowsiness detection）以及预防工伤和公共安全事故。相关数据如下： 44%深夜开车的司机会陷入危机行车安全的睡意中。 极度劳累的工作流程会提升至多35%的事故发生率。 长期微睡眠增加工人伤亡概率及缺勤率，降低工人生产效率。 美国疾病控制与预防中心研究指出，来自12州的74,571的成年受访者中，仅35.3%称自己24小时能有7小时睡眠，48.0%称自己打鼾，37.9%称自己近前一月至少一次无意识陷入睡眠，4.7%称自己前一月至少一次在开车时陷入睡意。 美国国家公路交通安全管理局估计疲劳驾驶发生于2.5%致命道路交通事故及2%的致伤事故中。 1993年到2009年的16年间，疲劳驾驶造成的空难造成了250人死亡。 例如无聊的课程等单调事务也会导致微睡眠状态的发生，这时微睡眠也叫白日类催眠状态（英语：daytime parahypnagogia）。 睡债（英语：Sleep debt） 失眠症 昏睡 入睡抽動 也称Pitolisant。 International Classification of Sleep Disorders Diagnostic and Coding Manual, Archived copy (PDF). 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