Found somewhere on the net:
Happiness only lasts for a short time but the effect of it lingers.
The apartment is quiet and I'm typing away on my own. The rest of the family is outside chasing pocket monsters. I love having all of them around me but this way there's time to do some typing without tying them up while doing it. In other words I'm having me-time. But not for long. The rest of the family will be back soon and I really want them to be back.
They'll be here for a few days more and then I'm betting on happiness lingering.