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.
Men may be said almost to be compelled by the Stars, even in voluntary actions, by means of their corrupt affections and ignorance. - Cardan Girolamo (1501-1576)