以下为句子列表：
英文: The exact reasons for association between sleep duration and weight gain aren't clear but some research suggests that sleep deprivation alters hormones involved in appetite control and metabolism.
中文: 虽然其中的具体原因目前还不清楚，但已有研究表明，睡眠不足会改变体内影响食欲和新陈代谢的激素水平。
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