118 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 treat depression even though the conventioal treatments,which use drugs and electric shocks,often have serious side effects. 此题如何理解,missing a night's sleep immediately lifted their depression说明缺少睡眠会加重depression,那当然不应去用sleep-deprivation去治疗depression了,这有什么矛盾的。