有关英语优美短文摘抄精选 有关英语优美短文摘抄精选 有关英语优美短文篇一 Sleep 睡眠 Sleep is part of a person"s daily activity cycle. There are several different stages of sleep, andthey too occur in cycles. 睡眠是人天天日常活动循环的一部分。人的睡眠分多个阶段，而这些 阶段也是循环发生的。 If you are an average sleeper, your sleep cycle is as follows. When you first drift off intoslumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles willrelax, and your breathing well slow and become quite regular. Your brain waves slow down a bittoo, with the alpha rhythm of rather fast waves predominating for the first few minutes. Thisis called stage 1 sleep. For the next half hour or so, as you relax more and more, you will driftdown through stage 2 and stage 3 sleep. The lower your stage of sleep, the slower your brainwaves will be. Then about 40 to 60 minutes after you lose consciousness you will havereached the deepest sleep of all. Your brain waves will show the large slow waves that areknown as the delta rhythm. This is stage 4 sleep. 假如你是一个正常的睡眠者，你的睡眠循环会这么进行。在你开始昏 昏入睡时，你的眼睛会滚动几下，体温略有下降，肌肉放松，呼吸变得缓慢而有 节奏。除了开始几分钟比较快的α节奏外，脑电波也稍有减缓。这被称为第一阶 段睡眠。在随即约半小时内，你深入放松，进入第二和第三阶段睡眠。睡眠越 深入，脑电波就越缓慢。大约在开始睡眠后的40到60分钟，你将进入沉睡状态。 这时的脑电波表现为巨大的缓波，被称为δ节奏。这就是第四阶段睡眠。 You do not remain at this deep fourth stage all night long, but instead about 80 minutes afteryou fall into slumber, your brain activity level will inc
