特别广播英语第 195 课：To Sleep, Perchance to Dream 睡觉，偶尔做做梦-3

They suggest the answer may be the lack of association with other humans during the period of sleep. 他们认为答案可能是睡眠期间缺少与他人的交流。

Once the two doctors established scientifically what common sense and folk wisdom had long taught - namely, that there is link between sleep and how we feel - they set out to learn what parts of our mood are related to which specific parts of the sleep cycle. 两位医生一旦把常识和民间智慧长期教给他们的东西--即睡眠与我们的感觉之间有联系--科学地确定下来，他们就着手了解我们的情绪的哪些部分与睡眠周期的哪些具体部分有关。

Normal sleep is broken into five distinct parts - Stages 1 through 4, plus REM, an acronym for rapid eye movement. 正常睡眠可划分为五个不同部分，从第一阶段到第四阶段，加上REM。

Much remains unknown about each of the five sleep stages. Most dreaming occurs during REM sleep, a period when the eyeballs move rapidly beneath the closed lids. 每一个阶段都有许多人们未知的知识。大部分的梦发生在REM睡眠期间，眼球在紧闭的眼睑下快速移动。

And whether they remember or not, all adults dream, usually four to six times a night.不管成年人是否记得，他们都做梦，通常一夜4到6次。

Three types of mood are strongly related to some specific stage of sleep. 三种情绪和睡眠的某一阶段紧密相关。

Our friendly, aggressive, and sleepy feelings all relate to Stage 2 sleep, which accounts for most of our total sleep hours. 我们友好的、有攻击性的、困倦和睡眠的某一阶段紧密有关。我们大部分的睡眠在第二阶段。

Our friendly and sleepy feelings, but not our aggressive feelings, are affected as well by Stages 3 and 4, and by how long it takes us to fall asleep.我们友好的、困倦的、但没有攻击性的睡眠时间也受到第三、第四阶段以及我们多久才能入睡的影响。

This means that if you get less sleep than normal - and people vary a great deal in how much sleep they normally require - you awake more friendly, more aggressive, and less sleepy. 这就意味着如果你比平时睡得少些--在政党情况下需要多少睡眠，人与人之间是有很大差别的--你醒后就会更加友好、更有攻击性、少些困倦。