As an afterthought to the summary in Happines entry...
What happens when your dream comes true? You feel happy... for a while. Quite often, and this occurs especially regularly when you dreamed of something — a new phone, car, house, you name it — you just get used to it. The state of joy that you had gradually fades.
This is the way our minds work. We get used to something good (and even to something bad — that is why people can survive even extreme hardships).
If you expect that winning millions on a lottery would make you happy you are bound for disappointment :)
