The song is about the act of learning how to be happy, or rather, learning how to accept that fact that there will be times where one is unhappy, and when those times occur, it's okay to be sad, upset, or whatever emotion takes its place. I tried to link it to the act of learning a "sunny dance", which, hypothetically, is a dance that bring the sunlight in. It's less about, however, being in a "sunny mood" and more about clearing away the thoughts that if you are unhappy you should just suck it up and put on a brave face, because that's not the way to go.
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nostraightanswer's song for ASDR's compilation, Wavelength. All profits from the album go straight to Befrienders, an international suicide-prevention non-profit.