Okay, time for science.
"Happiness" is a group of hormones that are produced, stored and released by your body.
When they are released, you feel happy.
However, there is a catch. They are not unlimited in supply.
If you use too much of happy hormones, what happens is that you "run out of happiness".
The condition where you run out of happiness is when you become very happy for a short time, using up all your happiness supplies. Then after happiness supplies run out, you cannot be happy anymore until supplies are restored by production of hormones.
To prevent yourself from "running out of happiness", you must use your happiness carefully.
If you engage in activities that bring too much happiness, you will use up your happiness supply really quickly.
Take for example, when you listen to music. The more you listen to music, the less happier it makes you. At first, its great, but later it just doesnt make you happy anymore. Thats because you used up all your happiness supplies.
So in order to have good amount of happiness supplies, you must first understand that happiness supplies last longer if you use them less.
If I try to do activities that make me happy all the time, what will happen is that they will stop making me happy.
However, if I spend time doing boring activities, I wont be using my happiness supplies, allowing them to be increased during boring activities to be used later. Then when I do fun activities after boring activities, they will make me much more happy than if I just did fun activities all the time without doing boring activities first.