评价睡眠质量不仅仅在于睡眠时间的长短，而且还包括入睡的快慢、睡眠的深度，以及睡眠结构是否合理。
The appraisal of sleep quality not only lies on the length of sleep time, moreover also on the speed of falling into sleep and the depth of sleep, as well as whether the sleep structure is reasonable.
深度睡眠时，参与者的大脑表现与鸟类、海豚相似。
During deep sleep, the participants' brains behaved in a similar manner seen in birds and dolphins.
当研究人员在第二和第三晚重复实验室里的实验时，他们发现在深度睡眠时左脑不能以同样的方式受到刺激。
When the researchers repeated the laboratory experiment on the second and third nights they found the left hemisphere could not be stimulated in the same way during deep sleep.
它通常发生在睡眠的最初几个小时，这个阶段被称为深度睡眠阶段。
It usually happens in the first few hours of sleep in the period called deep sleep.
在第三和第四阶段（通常称为“深度睡眠”），这时唤醒一个人是很难的。
During stages three and four (often called "deep sleep") , it is very hard to wake up a person.
随着时间的推移，睡眠不足会让人更加容易生病，尤其是深度睡眠和快速眼动睡眠时间不足时。
Over time, not having enough sleep—especially deep and REM sleep—can cause one to become sick more easily.
由深度睡眠激发改善的记忆力还有另一个好处：让人想象——并且更好计划——未来。
Boosted by deep sleep, an improved memory may have yet one more benefit: helping you imagine-and better plan for-the future.
酒精会让你无法进入深度睡眠。所以就算你酒后睡了足够的时间，你也不会感到你休息过。
Alcohol keeps your body from entering deep sleep, so even if you get the same hours of sleep, you won’t feel as rested.
该装置可以衡量你的深度REM睡眠，你在夜里会醒来几次，然后在适当时间把你叫醒。
It measures both your deep and REM sleep, how many times you're woken up in the night and then wakes you up at the appropriate time.
由顶尖手机企业赞助，研究显示睡前使用手机致使进入深度睡眠阶段的时间明显延长。
Sponsored by the leading mobile phone companies, it showed that using handsets just before going to bed caused people to take longer to reach deeper stages of sleep.
这份研究还发现睡眠质量很重要，换言之，与辗转反侧的轻度睡眠或不能马上入眠相比，深度的和不间断的睡眠更能让你远离感冒。
The same study also found that quality of sleep is important.
如果你睡了超过20分钟，你会度过眼动睡眠而进入睡眠的下一阶段，深度睡眠。
If you sleep longer than about 20 minutes, you'll pass out of REM and into other (deeper) phases of sleep.
结果发现，受到辐射的那组研究对象进入深度睡眠第一阶段所用的时间较长，而且深度睡眠的时间也较短。
The first group took longer to enter the first of the deeper stages of sleep and spent less time in the deepest one.
大量研究已经发现缬草改善深度睡眠，提高入睡的速度和睡眠的整体质量。
Numerous studies have found that valerian improves deep sleep, speed of falling asleep, and overall quality of sleep.
斯坦利博士说：“在夜间睡眠的头三个小时里，由于身体正处于深度睡眠状态，你几乎不会醒来。”
'you almost certainly won't wake up for the first three hours of night as you are deeply asleep,' says Dr Stanley.
已经有多项研究证实，女性通常会有更多的慢波睡眠，也就是最深度的睡眠。
Multiple studies have shown that women generally have more slow-wave sleep, which is the deepest sleep.
如果威尔伯说的是正确的，事实上冥想的高级练习者深度睡眠中也可以在某种程度上持续意识到自己的觉醒状态。
If Wilber is correct, then some advanced practitioners of meditation may actually be able to maintain a form of conscious awareness of even the formless void of deep sleep.
深度睡眠时大脑对外界的激励有抵抗力，这解释了为什么很难叫醒梦游者。
The brain is resistant to arousal during deep sleep, which explains why it's difficult to wake a sleepwalker.
我觉得最好的办法是打开你的窗户和窗帘，让自然的光亮将你从深度睡眠中唤醒。
The best way I feel is to open your Windows and curtains, and allow natural light to lift your from your deep sleep.
该研究称，手机产生的辐射会导致失眠和头痛，而且会缩短深度睡眠的时间。
It claims that radiation from the handset can cause insomnia and headaches as well as cutting the time spent in deep sleep.
同样，轻度睡眠也随着年龄的增加而增加，深度睡眠则相反。
Also, the amount of light sleep increases with age, and the amount of deep sleep is reduced.
同样，轻度睡眠也随着年龄的增加而增加，深度睡眠则相反。
Also, the amount of light sleep increases with age, and the amount of deep sleep is reduced.
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