I started to feel a bit down this Monday morning, just because of a relationship issue with my friend. Thinking about that distracted me from concentrating on the lecture in class. I had been in bad mood all the morning until I received a sweet message from my boyfriend, “Do me a favor, smile”. Yes, I did. I smiled and wrote down another “very sweet” message and sent back to him. You can also do the same thing for yourself. Take about 10 minutes each day (before going to bed is the best time), write down anything fun, interesting, good thing have happened to you today. You don’t have to be happy all the time, but start such a habit like that may improve your mood, and get you thinking positively.