1-snooze 小睡，打盹

Can you snooze yourself to death?

2-a host of 大量的

As you head down the chart toward fewer hours of sleep, the risk of death increases for a whole host of reasons, but there is a rising risk of death as you increase the amount of sleep.

3-confound 使困惑，使惊讶

Sometimes a curve is J-shaped because of some other confounding factors.

4-chronic ailment 慢性病

5-prompt 促使，驱使

Experts have discussed how various diseases and chronic ailments prompt someone to sleep more yet also put them in higher risk of death.

6-eliminate 排除

They tried eliminating people who had illnesses, and found similar results.

7-note 注意到；提出

8-causality 因果关系

But it is also important to note that even these researchers note causality cannot be definitely proven from this or other observational studies.

9-whereas 然而

40 percent of Americans regularly sleep six or less per night, whereas only 5 percent get nine-plus hours.

10-The jury is still out 悬而未决的，未作出结论的

11-surplus 过剩的，多余的

12-sleep-deprived 睡眠不足

The jury is still out on how surplus sleep could hurt you, but it is definitely in on how harmful it is to be sleep-deprived.