svitati

1. (of daybreak) to dawn; to be getting light
   Napolju već sviće, a mi još nismo spavali. — It's already getting light outside, and we still haven't slept.
   Leti sviće oko pet sati. — In summer it gets light around five.
2. colloq. (to someone: sviće mi) to dawn on someone
   Tek sad mi sviće šta je hteo da kaže. — Only now is it dawning on me what he meant.

Usually used impersonally in the 3rd person singular (sviće); the perfective is svanuti.