At the end of the each four cycle of yugas, the Vedas are destroyed and in each satya yuga, the respective Manu rewrites the scared shastras. In each manvantara, Manu the seven rishis, Indra the gods and the kings are created afresh. Fourteen manvantaras make a kalpa. And at the end of a kalpa comes Brahma’s night. During that night, Vishnu in his form of Brahma sleeps on the waters that are everywhere.