[讨论]Prep 1-70,题目怎么理解

According to a review of 61 studies of patients suffering from severely debilitating depression, a large majority of the patients reported that missing a night's sleep immediately lifted their depression.  Yet sleep-deprivation is not used to treat depression even though the conventional treatments, which use drugs and electric shocks, often have serious side effects.

Which of the following, if true, best explains the fact that sleep-deprivation is not used as a treatment for depression?

(A) For a small percentage of depressed patients, missing a night's sleep induces a temporary sense of euphoria.

(B) Keeping depressed patients awake is more difficult than keeping awake people who are not depressed.

(C) Prolonged loss of sleep can lead to temporary impairment of judgment comparable to that induced by consuming several ounces of alcohol.

(D) The dramatic shifts in mood connected with sleep and wakefulness have not been traced to particular changes in brain chemistry.

(E) Depression returns in full force as soon as the patient sleeps for even a few minutes.

题目意思是说，因为绝不部分忧郁的病人，如果失眠过后，会更忧郁。所以‘不让’睡觉‘这个疗法没有用来治疗忧郁，尽管传统疗法有很多副作用。

E说，病人只要一睡觉，忧郁就会回来，强度和原来一样。-----如果是这样的话，那就不该让病人睡觉，那么’sleep-deprivation ‘就应该用来治疗啊。   这个怎么来解释现象呢？

我选的是C，就是失眠会导致暂时的没有判断力，效果就跟喝酒一样。----这个好像也无关啊。

请高手解释一下，多谢。

很多朋友看了，为什么没有人回答呢，

武夷山小而不为啊。哈哈

E说，病人只要一睡觉，忧郁就会回来，强度和原来一样。-----如果是这样的话，那就不该让病人睡觉，那么’sleep-deprivation ‘就应该用来治疗啊。   ---完全不睡觉是不可能的，而短期不睡觉只在不睡觉之后短时间有缓解作用，一睡觉就又变得抑郁，所以不睡觉不能作为有效的治疗手段。.

连起来看，好像有点懂了。

因为一个人完全不睡觉是不可能的。所以如果你不让他睡，他就很有可能会睡一小会。而睡一小会，就会和原来一样郁闷。所以就不能用了。

这道题的难度在于，题目的里说，失眠是原因，选项里又说，睡觉是原因。搞得我们很糊涂。

如果只考虑加强结论，不考虑题干里的原因，那这道题应该能好做一点。