suṣuptiḥ
Deep sleep.
In Vedanta
The deep sleep state — in which the individual (called prājña) resolves into causal ignorance. There is no experience of duality, no suffering, no sense of limitation. The Māṇḍūkya Upaniṣad identifies this as the third pāda. Deep sleep is significant because it reveals that ātmā continues to exist even when the mind is resolved — 'I slept well, I knew nothing' shows both the continuity of the witness and the presence of ignorance.