core concepts and philosophy
What does the Mandukya Upanishad say about the dreaming state (taijasa)?
The four states and where taijasa fits
The Mandukya Upanishad maps consciousness into four quarters. The first is the waking state, called vishva. The second is the dreaming state, taijasa. The third is deep dreamless sleep, prajna. The fourth, turiya, stands apart from all three and is the subject of the Upanishad's deepest teaching. Taijasa is the second quarter, the dreaming self.
What taijasa means
The word taijasa comes from tejas, meaning light or radiance. The tradition calls the dreaming self the shining one because in the dream state the mind lights up its own world from within. There is no sun, no lamp, no outside object. The dreamer sees by an inner light. This is one reason the tradition finds the dream state striking. It shows that the mind can build a whole world, complete with sights, sounds, and feelings, out of itself alone.
How dreams are understood here
In the waking state, vishva, the self moves through the outer world and takes in objects through the senses. In the dreaming state, taijasa, the self turns inward. The objects of the dream are not outside. They are projections of the mind itself. The tradition holds that the dreamer experiences these as real while the dream lasts, just as waking experience feels real while we are awake. The Upanishad uses this parallel to raise a deeper question about the nature of all experience. In deep sleep, prajna, even this inner world of images disappears. There is rest but no awareness of objects at all.
What the comparison is pointing at
The Mandukya Upanishad is not simply describing sleep science. It is building toward a larger point. By laying out waking, dreaming, and deep sleep side by side, it asks the reader to notice that each state has its own kind of reality, and each one ends. The dreaming state, taijasa, is especially useful for this because it makes clear that what feels real can be entirely mind-made. This becomes a way into the Upanishad's central teaching about the nature of the self and of consciousness itself.
How people engage with this today
For many people studying Vedanta today, the three states, waking, dreaming, and deep sleep, are a starting point for thinking about consciousness and identity. Teachers often use the dream example because it is something everyone knows. You were certain the dream was real. Then you woke up. That shift is the kind of shift the Upanishad is pointing toward. The text is short but considered one of the most concentrated in the Upanishadic tradition.