“Seth material” search engine (Jane Roberts)

A few of them did involve a tuning into the dream universe. There are many stations, so to speak, to tune into, and at present you touch the dials rather indiscriminately. Planes of actuality of one sort or another everywhere exist. I mean that literally. The apparent emptiness of outer space is far from empty, but these are not necessarily worlds that you could visit with the most advanced imaginable spaceship.

You would not be able to perceive a sufficient amount of data to make any deductions. This is not to say that such planes or fields of actuality cannot in some manner be perceived, but they will escape physical perception or exploration. In dreams, when the self is somewhat free from camouflage, perhaps it is possible for the self then to travel spontaneously into such fields of actuality; but since they are as bizarre to the self as is the dream world itself, then there is no way, usually, for the sleeper to distinguish between the universe of dreams or other actualities.