In your own individual experience, you experience a deep sleep world. In the Vedantic theory of consciousness, there are two worlds: One is the dreamer's world and one is Maya. Consciousness experiences a causal world where all the variety of differences of the waking and dream worlds are merged together,. lumped together into a potential state called Maya. This is a standard terminology in Advaita Vedanta.
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Karika 1-5.