Sleep
睡眠
Sleep is part of a person's daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows. When you fist drift off into slumber, your eyes will roll about a bit, you temperature will drop slightly, your muscles will relax, and your breathing well slow and become quite regular. Your brain waves slow and become quite regular. Your brain waves slow down a bit too, with the alpha rhythm of rather fast waves 1 sleep. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep. slower your brain waves will be. Then about 40to 69 minutes after you lose consciousness you will have reached the deepest sleep of all. Your brain will show the large slow waves that are known as the delta rhythm. This is stage 4 sleep.
睡眠是一个人日常活动周期的一部分。睡眠有几个不同的阶段，它们也是循环发生的。如果你是一个普通的睡眠者，那么你的睡眠周期如下。当你的拳头睡着时，你的眼睛会翻一会儿，你的体温会轻微下降，你的肌肉会放松，你的呼吸会缓慢，变得很有规律。你的脑电波会变慢，然后变得很有规律。你的脑电波也会慢一点，还有快速的节奏。在接下来的半小时左右里，随着你越来越放松，你将会进入第二阶段和第三阶段的睡眠。你的睡眠阶段就越低。你的脑电波会变慢。在你失去意识40到69分钟后，你会睡到最深的觉。你的大脑会显示出巨大的慢波，被称为三角律。这是第四阶段的睡眠。
You do not remain at this deep fourth stage all night long, but instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. It is during REM sleep period, your body will soon relax again, your breathing will slip gently back from stage 1 to stage 4 sleep----only to rise once again to the surface of near consciousness some 80 minutes later
你不会整晚都停留在这一深深的第四阶段，而是在你入睡大约80分钟后，你的大脑活动水平会再次略有增加。三角洲节律将会消失，取而代之的是脑电波的活动模式。你的眼睛会开始在你闭着的眼皮下掠过，就好像你在看你面前发生的事情一样。这段快速的眼动时间会持续大约8到15分钟，被称为快速眼动睡眠。在快速眼动睡眠期间，你的身体很快就会再次放松，你的呼吸会从第一阶段慢慢恢复到第四阶段的睡眠——直到大约80分钟后才会再次上升到接近意识的表面。
