The sun in a dream commonly represents clarity and vitality -- a sense that something confusing is finally coming into focus, or that your energy is returning after a depleted stretch. A blinding or overpowering sun can instead point to optimism that feels forced, pressure to appear fine when you aren't.
When thou shalt be interrogated for a father, behold the fourth house; for a brother, the third; of a son, the fifth; of a wife, the seventh: But if for a sick person, behold the ascendant only. - William Lilly (1602.-1681.)