“[Cosmic] dissolution,” a notion that appears in Hindu metaphysics and mythology. According to the tradition, a cosmic cycle has a duration of 2.16 billion years. At the end of each cycle, the Universe is temporarily dissolved in Vishnu, plunged into a state yoga nidra (yogic sleep), and remains in this condition of pralaya until the great god reawakens. This suggests the dissolution of mental activity and the absorption into the highest Self. However, pralaya, which is actually our dissolution in the Supreme Self, happens in a passive way, as in a deep dream.