Just as you choose your friends on the physical conscious plane, so do you attract kindred beings to you in the astral world. By keeping our homes clean and peaceful, by keeping our bodies and clothing fresh and clean, the odic force becomes quite pure and enables us to be more actinically alive. This condition also keeps astral people away from us, so long as we do not ourselves enter into an astral vibration. The actinic vibration keeps all astral influences away just as doors, locks, windows, and walls discourage unwanted physical entrance into buildings. It is not advisable to admit astral entities if you are sensitive to this possibility, for doing so creates a double influx of odic force, whereas the striving of a Yoga student is to become actinically superconscious and not to intensify the odic subconscious.
Astral entities live in their own world on the astral plane.
Possibly you enter this plane at night too, but during the day we must attend to our conscious mind activities and take care of our immediate programs, keeping the two worlds apart as distinctly as our sleeping state is separated from the state of being awake. You will benefit greatly as you grasp this exercise subconsciously, for it will release you from the astral plane to a higher plane during your sleeping hours. This higher plane is easily reached by those who learn dynamic meditation. Meditation, as you know, occurs when the conscious as well as the subconscious mind is concentrated upon the same thing. The odic forces of both of these states of mind are consciously under the actinic control of your superconscious.