参考答案

正确答案：D
解析：根据题干关键词sleep restriction定位到原文第二分标题下第四句：Sleep restriction has been linked to many problems including mood disorders like depression and anxiety，weight gain，and a shorter life expectancy．可知睡眠不好往往会引起许多情绪紊乱的情况．其中包括郁闷焦虑、体重增加、寿命缩短。故 D项符合原文。