Well astral projection is real but is risky at the same time... The natural way of experiencing out of body travel is written in Vedas and old scriptures of India. It's like a person who's been doing yoga for a long time and has able to control all his chakras is the one who could take this experience. Well in modern science it's done through different ways but the fact it exists is real. Astral projection is our state of mind and consciousness where the body is left relaxed and our soul or consciousness travels the world. In ancient the person who could do was known to have power and ability to read minds and much more cuz' he had controlled all his senses and activated all his chakras. His 6th sense, 7th... were all under his control. Well I could explain it in short and I'm science student but not specifically a student of quantum physics and this, I'm more of biotechnology student. So if you wanna know about it more I'll suggest you to read journals, books, and many approved by scientists talks and podcasts cuz' it's not a topic to dive deeper or try it out without having it's actual knowledge. Many cases of people trying it but weren't able to get back to their consciousness are came and that's why it's risky cuz' in that case the person has lost his senses and could even harm people or do something really regretful.