问:在学校午休的时候,趴在桌子上睡,身体突然抖了一下,我就醒了,像是掉入了深渊,而且醒来后,心跳的频率一直很快,有种很真实的恐惧感。为什么快要睡着的时候会不自觉的浑身抖一下?答:我也经常这样,有时候躺在床上快睡着时,突然感觉要从床上掉下来一样,也会惊醒。这种现象很正常,是大脑皮层在刚入睡时对下一级运动神经中枢的控制减弱而出现的不自主抽动现象。自主神经系统在监测到你的呼吸频率太低的时候,为了 Q: When I was at school, I fell asleep on the table, my body suddenly shuddered, and I woke up like falling into the abyss, and when I woke up, the frequency of my heartbeat was fast and there was a real fear sense. Why do I fall asleep when I involuntarily shake? A: I often do, sometimes lying in bed asleep, suddenly felt like falling from the bed, will wake up. This phenomenon is normal, is the cerebral cortex just fell asleep on the next level of motor nerve center control weakened appear involuntary twitching phenomenon. Autonomic nervous system in monitoring your breathing rate is too low, in order to