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