I discovered this was possible when I was 12. It's incredible. You need a lot of patience and it can take months to be able to successfully do it. Basically, it is leaving your body in your sleep, but you can travel anywhere so it's not that much like astral projection. You must lie in bed and close your eyes. Stretch out your toes, legs, abdomen, and so on. Visualize where you want to go (I always go swimming with dolphins in the atlantic ocean in my astral mermaid form). Imagine your body dissapearing to your destination. (it will not, only your astral self) Feel yourself becoming light as air. You will soon feel the breeze amd temperature of your chosen location. Be careful, because opening your eyes or simply thinking about your bed will immediately transport you back. Good luck!