论文部分内容阅读
词数:562阅读难度:建议阅读时间:6分钟Over the years,scientists have come up with a lot of ideas about why we sleep.Some have argued that it’s a way to save energy.Others have suggested that slumber provides an opportunity to clear away the brain’s cellular waste.Still others have proposed that sleep simply forces animals to lie still,letting them hide from predators.
Words: 562 Reading difficulty: Recommended reading time: 6 minutes Over the years, scientists have come up with a lot of ideas about why we sleep.Some have argued that it’s a way to save energy. Otters have suggested that slumber provides an opportunity to clear away the brain’s cellular waste.Still others have proposed that sleep simply forces animals to lie still, letting them hide from predators.