In fact, the slow caffeine metabolizers, on average, had almost an hour less sleep when they were exposed to coffee.

事实上，咖啡因缓慢代谢者喝咖啡时，平均睡眠时间少了近一个小时。

But the results varied a lot from person to person depending on whether they were fast or slow coffee metabolizers — which is determined by your genetics.

但每个人的结果相差巨大，而这取决于他们是快速还是缓慢的咖啡代谢者——这是由你的遗传决定的。