选择追踪自己睡眠的人可能会努力比普通人睡得久。
People who elect to track their sleep may try to get more sleep than the average person.
当你这么考虑问题时，追踪什么就会有很多不同的选择。
When you consider this, there are several different options for what to trace.
这样做的效果好于选择随机亲本并保持对哪些已经是亲本的追踪。
This works better than selecting random parents and keeping track of who has been a parent already.
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