睡觉的四个周期
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">1、非快速动眼<span style="color: black;">睡觉</span>(NREM)<span style="color: black;">第1</span><span style="color: black;">周期</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">这是人们从清醒状态向<span style="color: black;">睡觉</span>状态转变的最初<span style="color: black;">周期</span>。在这个相对较浅的<span style="color: black;">睡觉</span><span style="color: black;">周期</span>中,你的肌肉放松,心率和<span style="color: black;">呼气</span>放缓,胶电波活动地会减弱。这一<span style="color: black;">周期</span>最长<span style="color: black;">能够</span><span style="color: black;">连续</span>5分钟</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="//q5.itc.cn/images01/20240304/2649aa647dfc42418809eff3631ef5cb.jpeg" style="width: 50%; margin-bottom: 20px;"></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2 、NREM第二<span style="color: black;">周期</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">在接下来20分钟<span style="color: black;">上下</span>的时间里,你会进入一个程度更深的<span style="color: black;">睡觉</span><span style="color: black;">周期</span>。<span style="color: black;">心率</span>、<span style="color: black;">呼气</span>频率会继续放缓,体温随之下降,眼球<span style="color: black;">亦</span>停止了转动。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">3 、NREM第三<span style="color: black;">周期</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">在<span style="color: black;">全部</span><span style="color: black;">睡觉</span>周期中程度最深的<span style="color: black;">睡觉</span><span style="color: black;">周期</span>,所有的生命指标都降至最低水平,肌肉完全放松。该<span style="color: black;">周期</span>最长<span style="color: black;">能够</span><span style="color: black;">连续</span>40分钟,<span style="color: black;">同期</span>,人们认为这<span style="color: black;">亦</span>是<span style="color: black;">全部</span><span style="color: black;">睡觉</span>周期中最能恢复精力、<span style="color: black;">弥补</span>体力的<span style="color: black;">周期</span>。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">4、快速动眼<span style="color: black;">睡觉</span>(REM)<span style="color: black;">周期</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">在这个<span style="color: black;">周期</span>,大脑活动加快,眼球<span style="color: black;">起始</span>快速转动,但肌肉仍<span style="color: black;">处在</span>张力缺失,<span style="color: black;">亦</span><span style="color: black;">便是</span>暂时性的瘫痪状态。人<span style="color: black;">一般</span><span style="color: black;">便是</span>在这一<span style="color: black;">周期</span>做梦的。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="//q6.itc.cn/images01/20240304/5d3faae6b5c04bd1b8da955e51b775bc.jpeg" style="width: 50%; margin-bottom: 20px;"></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">犯困</span>大王</strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">考拉是世界上最爱打的动物,它<span style="color: black;">每日</span>的<span style="color: black;">睡觉</span>时间竟高达22个小时,为数不多的清醒时间都用来<span style="color: black;">摄食</span>桉树叶。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">这些夜行动物之<span style="color: black;">因此</span><span style="color: black;">每日</span>要睡这么长的时间,其实是<span style="color: black;">由于</span>它们特殊的<span style="color: black;">膳食</span>习惯。桉树叶中含有有毒的氰化物,<span style="color: black;">针对</span><span style="color: black;">非常多</span>动物<span style="color: black;">来讲</span>是致命的,但对考拉却没什么杀伤力。考拉<span style="color: black;">每日</span>摄入大约500克树叶,<span style="color: black;">海量</span>的有毒物质都被它们<span style="color: black;">自己</span>消化分解。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="//q2.itc.cn/images01/20240304/878b2e7b762b49fe8e3b910a3420b0bd.jpeg" style="width: 50%; margin-bottom: 20px;"></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">然而,它们<span style="color: black;">亦</span>为这种能力付出了相应的代价。桉树叶本身含有的营养物质非常少,考拉要代谢桉树叶中的有毒物质<span style="color: black;">必须</span>消耗<span style="color: black;">海量</span>的能量。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">正因如此,考拉<span style="color: black;">到底</span><span style="color: black;">为何</span>会对按树叶情有独钟,仍是<span style="color: black;">专家</span>百思不得其解的谜题。<a style="color: black;"><span style="color: black;">返回首页,查看<span style="color: black;">更加多</span></span></a></p>
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