最近，上課總是很困，讀完了文章之後，知道了跟自制力有很大的關系。你一旦上課開始犯困，不但學習沒學好，可能這一天都很昏昏沉沉的。現在解決了犯困的問題，就可以多騰出很多時間來學習，頭腦也變得清楚了，心情也很好。
Recently, always is very sleepy in class， after we read article， I know this have very big relation with self control， if you begin to sleepy in class， you not only study not well,maybe this day you will be dazed. Now solve sleepy problem, I will have more time to study, my brain also became clear, I also have a nice mood.