Human beings need light in order to thrive. That must be why melancholy and depressions are fairly common among people in in countries with long, dark winters. Of course we mainly need light from the sun, but what a difference it makes when a dark room is enlightened by candles! I immediately relax and feel at home..
At breakfast, when it's still pitch dark outside, I surround myself with candles. That way my day starts off in a cosy and caring way, and for the rest of the day I carry along a warm feeling of being at home with myself, wherever I am.