Sleeping pills prescribed by your physician are supposed to ward off the myriad of health problems that come with lack of sleep. But adults who take sleeping pills in even small numbers over their lifetimes may be nearly four times more likely to die earlier compared to those who are not prescribed sleeping pills, according to new findings published two years ago inBMJ. And those prescribed sleeping pills may also be more likely to be diagnosed with cancer, the study found.

a. What is the exposure?

b. What is the outcome?

c. What is the population at risk?