A dream analysis is the process of evaluating dreams to determine there meaning. Perhaps, when Lisa looked at Brad's test she saw snakes because she knew that cheating was bad. When the teacher looked at her, she knew she had been caught in the act which is why the floor suddenly fell and she was floating in the ocean. She panicked. I imagine Lisa had this dream because she actually does have a big test that she is worried about. She might be tempted to try to cheat, but knows that it is wrong.
