As yet a challenge to explain the cause-and-effect relationship between sleep and nutrition, there may be a third factor that impacts both of them.

要解释睡眠和营养之间的因果关系，还有一个挑战，那就是可能有第三个因素对它们两者都有影响。

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It's as yet a challenge to explain the cause-and-effect relationship between sleep and nutrition. There may be a third factor that impacts both of them.

迄今为止，解释睡眠和营养间的因果关系仍是一个挑战。可能存在第三个因素影响这两者。

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Instead, maximizing sleep overnight seems to have the strongest effect on encoding new information.

相反，最大化整夜睡眠时间似乎对编码新信息有最强作用。

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Dr Janet Mullington, of Harvard Medical School, said there were many questions still to be answered about the effect of sleep deprivation.

BBC: Lack of sleep 'hits women harder'

Another study of 119 cancer patients with difficulty sleeping found valerian before bedtime for two months had no significant effect on sleep scores calculated from a questionnaire filled out before the study and after two months.

WSJ: Can a Root Get to the Problem of Insomnia?

Finally, make sure that you are getting at least seven to eight hours of sleep, as there has been considerable research in the last five years on the effect of getting too little sleep on obesity.

CNN: Best way to jump-start your metabolism after a plateau?