As one of the \"big three\" in ancient Greek philosophy， along with Plato (柏拉圖) and Socrates(蘇格拉底) ， Aristotle laid the groundwork for the modern study of biology. Among his great biologic works， \"On Sleep and Sleeplessness\" is an essay about the function of sleep and how it does function. As a sensitive woman， I have little interest in \"cold\" serious scientific analysis， but one sentence in the essay catches my attention: \"for all organs which have a natural function must lose power when they work beyond the natural time- limit of their working period\" (Paragraph 7). I'm steeped in deep thought.