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You should do self-study at least three hours a day.

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Exercise 2. Translate the passage into English.睡前尽量避免紧张的脑力活动，试试深呼吸，瑜伽功或轻轻伸展一下身体以减轻一天的压力。专家们还建议在床头柜放一个笔记本，记下第二天要办的琐事。每晚睡前坚持这样做就会让身心都做好睡眠准备。