题目：
An ancient， traditional remedy for insomnia—the scent of lavender flowers—has now been proved effective. In a recent study， 30 volunteers with chronic insomnia slept each night for three weeks on lavender-scented pillows in a controlled room where their sleep was monitored electronically. During the first week， volunteers continued to take their usual sleeping medication. They slept soundly but wakened feeling tired. At the beginning of the second week， the volunteers discontinued their sleeping medication. During that week， they slept less soundly than the previous week and felt even more tired. During the third week， the volunteers slept longer and more soundly than in the previous two weeks. Therefore， the study proves that lavender cures insomnia within a short period of time.
Write a response in which you discuss what specific evidence is needed to evaluate the argument and explain how the evidence would weaken or strengthen the argument.
中文翻译：
一种古老的传统治疗失眠的偏方——薰衣草花香，现在被证明是有效的。在一次最近的调查中，30名患有慢性失眠的志愿者在三周之内每晚都在一个受监视的控制室内睡在带薰衣草花香的枕头上。在第一周，志愿者继续服用他们常用的安眠药。他们睡得很沉但醒来时很累。在第二周，他们不服用药物。结果与前一周相比他们睡得不那么沉并且感觉更累。在第三周，他们睡得比前两周时间长而且更深。这表明薰衣草在短时间内治愈了失眠。
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