Oh and I forgot to add - everyone is different so you might get all or none of the warning signals like breathlessness, tingling, buzzing or anything else. Personally only after T2 do I get the buzzing. I normally have signs in that I'm astral by the colour and perception of the room (like seeing hues rather than a solid colour). As weird as it sounds, I don't always realize I'm astral until I get a sign like seeing my body in bed or seeing something non physical. As of this moment, I know by immediately finding myself on the lower planes...ugh.