While some past research has identified a relationship between obesity and a lack of sleep, this research could not affirm which came first -- the lack of sleep or the weight problem.

• 而一些过去研究确定了肥胖病和缺乏睡眠的关系,但研究不能确定是缺乏睡眠导致肥胖，还是肥胖导致了失眠。