填写下面这篇文章的缺失部分。


A recent study found that people who sleep more have been found to be more productive at work. Specifically, they found that employees who slept an average of 8 hours a night reported being more productive than those who slept less.
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The study also found that individuals who regularly slept more than 8 hours a night did not experience any additional productivity benefits compared to those who slept an average of 8 hours. Additionally, the study suggests that it's not just the quantity of sleep that matters, but also the quality of sleep, with individuals who reported better quality sleep also reporting higher levels of productivity.