Red snake in a dream can be induced by external stimulus. For anyone, recently encountered intensive red color in waking life can be a reason of dreaming about red snake. It can be a blood, a sunset, a red apple, a red painting and anything else with red color. For a woman, a start of a period can be a cause of dreaming about snake in red. For a man, a spontaneous blood flow into reproductive organ is a trigger for the dreams about the red snakes. It can occur up to few times per night. Also, if closed eyes being touched by rising sun rays in a morning, it can invoke a red color snake dream.
Read more about dreaming of Red snake in other dream meanings interpretations.