sleep function的用法和样例：
例句
- An important clue about the function of sleep is the huge variation in the amount that different species need.
有关睡眠功能的一项重要线索是，不同物种的动物所需的睡眠时间有著巨大差异。 - All I want is the sleep function when I shut my laptop, shutting down and restarting is a pain.
所有我想的是睡眠功能当我关闭我的笔记本电脑，关机和重新启动是一种痛苦。
