He was tired because he had had insufficient sleep.
他很疲倦，因为他未睡足。
Insufficient sleep is a primary cause of fatigue driving.
睡眠不足是造成疲劳驾驶的主要因素。
Several studies have linked insufficient sleep to weight gain.
一些研究称睡眠不足导致体重增加。
Several studies have linked insufficient sleep to weight gain.
多项研究显示，体重增加与睡眠不足有关。
Several studies have linked insufficient sleep to weight gain.
有些研究还认为，体重增加与睡眠不足有关系。
Several studies have linked insufficient sleep to weight gain.
一些研究指出发胖和睡眠不足有关。
Several studies have linked insufficient sleep to weight gain.
一些研究将睡眠不足与体重增加联系到一起。
Which methods do you usually adopt when you feel like you are having insufficient sleep?
当你觉得你没有充足的睡眠时，你会采用甚么方法来解决这问题？
Which methods do you usually adopt when you feel like you are having insufficient sleep?
当你觉得你没有充足的睡眠时，你会采用甚么方法来解决这问题？
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