Some teachers complain that a few students feel sleepy or even fall asleep in class.
一些老师抱怨说，一些学生上课犯困，甚至睡着了。
You could be sitting in class or eating a meal, and fall asleep without warning, usually for a period lasting for a few seconds to a few minutes.
你可能正在课堂上，或者是正在进餐，然后忽然就睡着了几秒钟或者几分钟。
You could be sitting in class or eating a meal, and fall asleep without warning, usually for a period lasting for a few seconds to a few minutes.
你可能正在课堂上，或者是正在进餐，然后忽然就睡着了几秒钟或者几分钟。
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