Three good things

There are many things you can do to re-wire your brain towards happiness.Psychological research shows that the brain better remembers bad experiences than good. 5/1 is the weighting towards negative bias, ie you will need 5 good experiences to compensate for one bad.This basic human trait makes everything sound worse than it is. In many workplaces the talk revolves around the bad thing.. It is training issue – we need to get better at practicing to focus on the positive = train the brain to remember the positive experiences.So how do we do this?

There are many actions you can take, one of my absolute favorites is "3 good things". 
I like this one cause it is easy and doable on a daily basis.
First of all you get yourself a small notebook, preferably with a hardcover and feeling that you like.
Then you find a time of the day that would be suitable for you to take 5 minutes out of your day. Personally I use 5 minutes right before I switch of the light to sleep. I keep my blue silk book with magnet closing (I really like touching this book) on my night table and I have a soft purple ink pen laying next to it.
Every evening before sleeping I take out my hard cover blue silk book and my purple pen and I write down 3 things that made me happy that day. 
You can do this very simple by just jotting down the 3 things and then stop. Which personally I think is fine, especially in the beginning. As you get more comfortable doing this and the habit (21 days normally) is there, then you might want to expand your happiness training by following the routine from UC Berkeley’s Greater Good Science Center, outlined below:

1. Give the event a title (e.g., “co-worker complimented my work on a project”)
2. Write down exactly what happened in as much detail as possible, including what you did or said and, if others were involved, what they did or said.
3. Include how this event made you feel at the time and how this event made you feel later (including now, as you remember it).
4. Explain what you think caused this event—why it came to pass.
5. Use whatever writing style you please, and do not worry about perfect grammar and spelling. Use as much detail as you'd like.
6. If you find yourself focusing on negative feelings, refocus your mind on the good event and the positive feelings that came with it. This can take effort but gets easier with practice and can make a real difference in how you feel.

http://ggia.berkeley.edu/practice/three-good-things

Remember that the most important thing is not how big the event is, how happy on a scale of 1-10 it made you => what is important is THAT YOU DO IT!