“Seth material” search engine (Jane Roberts)

Now certain chemical changes must come about in the physical organism before projection can occur. Were it not for these you would still be imprisoned within the corporeal image. You know that dreaming has definite chemical bases, that chemicals built up during periods of waking existence are released through dreams. Not only are they released but they form a propelling action that allows energy to flow in the opposite direction. As chemical reactions allow the body to utilize energy and form physical materializations, so the excess built up then becomes a propelling force, allowing action to flow in what you would term subjective directions.

Now this same chemical reaction must also occur, only more strongly, before a legitimate projection of the self from the physical organism can occur. This is one of the main reasons why such projections happen rarely. Usually, and without training, the chemical excess is used in the dreaming process. In periods of exuberant energy and well-being a more than normal amount of excess accumulates. This can trigger a projection.