I think part of the problem is the idea that we are supposed to remain in a state of happiness.

I think it is more normal to experience life as a series of events, with a basic level of contentment and a range of emotion including, fear, sorrow, happiness and pleasure.

Often people confuse pleasure, eating a good meal, driving fast, whatever floats your boat with happiness.

Clearly we have moved well past a state of survival when we worry if we are happy enough.