Dreams

Demigods usually have dreams or visions that have a meaning.

Percy Jackson often has dreams of importance, such as his dreams about Thalia in The Lightning Thief and in The Sea of Monsters, his dreams about Kronos, Luke, Grover, etc.

In The Son of Neptune, Percy's dreams are the only thing keeping him connected to his past at Camp Half-Blood. Annabeth appears to Percy in one dream, marking her only appearance in The Son of Neptune. She warns Percy to stay where he is, because Tyson and Mrs. O'Leary are coming to find him. Percy must leave however, because of the quest.