Final answer:
Sir Edward Burnett Tylor described this type of religion as animism, which is based on the idea of a dual entity residing in a person's body.
Step-by-step explanation:
According to Sir Edward Burnett Tylor, the religion that is based on the idea that a person's body is inhabited by two entities - one that is active during the day and another (a double or soul) that is active during sleep and trances - is called animism. Tylor suggested that ordinary parts of the human experience, such as dreaming, formed the basis for spiritual beliefs, leading to the development of animist religions.