Happiness is to live a bright and rich life, full of events, joys, surprises, discoveries. To wake up in the morning and feel it flowing through your veins and pulsing around you.
But what if when you open your eyes you feel nothing? Even after a cup of coffee. What if a day = just a stretch of time, with a beginning and an end, with a watery, everyday surface in between. Routine.
You can look back and remember that there were colors in life, but they've faded, they're gone from the canvas of life.