Well... Happiness comes from a lot of things. I wouldn't call it the ultimate happiness. It is hard to achieve, and it ends every morning, no matter what. Happiness is like a food or drink, something you want, but can never be fully quenched. Things like games, friends, TV, life, and money can make you happy. BUT! Think about food, steak can make you not hungry (in a great way), but you will be hungry again.

Hope this makes sense. LDing doesn't drain me in any way. I feel rejuvinated, like after playing a sport or something. It is strange.