Taijasa is the dreaming state

The person who experiences the three states, viz., Jagrat or waking-state, Svapna or the dreaming state, and Sushupti or deep-sleep state is called Visva in the waking state, Taijasa in the dreaming state and Prajna in the deep sleep state. When one gets up from sleep, it is Visva who remembers the experience of Prajna in deep sleep and says, “I slept soundly. I do not know anything.” Otherwise remembrance of the enjoyment in deep sleep is not possible.- Swami Sivananda

Why do we dream?

Why do we dream? Various answers have been given to this question. Dreams are nothing but a reflection of our waking experience in a new form. The medical view is that dreams are due to some organic disturbances somewhere in the body, but more particularly in the stomach. Sometimes coming diseases appear in dreams.- Swami Sivananda

The desires only supply the impulse

The desires only supply the impulse. The mind creates the dream out of the materials supplied by the experiences of the waking state. The dream creatures spring up from the bed of Samskaras or impressions in the subconscious mind. Indigestion also causes dream. The Taijasa is the dreamer. It is the waking personality that creates the dream personality. The dream personality exists as the object of the waking personality and is real only as such.Swami Sivananda

Greatest achievement

The greatest achievement was at first and for a time a dream. The oak sleeps in the acorn; the bird waits in the egg; and in the highest vision of the soul a waking angel stirs. Dreams are the seedlings of realities." ~ James Allen from As a Man Thinketh