Definition - What does Svapna mean?
Svapna is a Sanskrit term referring to a state of being asleep and dreaming while also being conscious, or simply a state of dreaming. It is one of the four main states of consciousness, together with jagrat (waking), sushupti (deep sleep) and turiya (witness consciousness), as defined in the Upanishads and other yogic texts.
Yogapedia explains Svapna
The state of svapna is one where the yogi can perceive objects based on experiences from their waking state. It can be compared to human subconsciousness, individual mind and remembrance. It is the first stage in the practice of yoga nidra, where the yogi begins to explore his subconsciousness.
According to yogic texts, it is a state of meditation, a two dimensional experience and a perception of experiences gained in the waking state in the subconscious inner world.