I encountered a word dawn and I have a feeling I understood the meaning in context. For example,
1) It dawned on him that she had loved him.
means
2) It entered his consciousness that she had loved him.
I noticed that no dictionary states realize as a synonym of dawn.
3) He realized that she had loved him.
Is there a difference in meaning between 1 and 3? Could these two words be synonyms in dictionaries?