It's interesting that you said the experience was wild, as I agree but in a different meaning of the word. The process of "Astral Projection" is a variation of the wake induced lucid dreaming technique (WILD). The light and the noise were hypnagogic hallucinations. Hypnagogia/the hypnagogic state is a transitonal state between wakefulness and sleep and is experienced every night, but you usually aren't conscious for it. There is a similar state between slrep and wakefulness called the hypnapompic state. The alcohol may have helped if taken at the right time. It acts as a REM suppressant, but its effects quickly wear off (if taken in small amounts) which ends up causing REM rebound (more/longer dream time) and thus more successful lucid dreaming real estate, as it were. It sounds like you're making progress, but if I may give some advice; drop all the astral projection, light body, karma, chakra nonsense. All this dogma colors your experience through that particularly spiritual lens, which keeps you from experiencing the full joy and wonder of lucid dreaming and consciousness exploration in general.