From the unmanifested, all the manifested arise at the coming of day. At the coming of night, they dissolve into that same, into what is called the unmanifested.

Creation and dissolution: from avyakta (unmanifested, causal principle), vyaktayaḥ (manifestations, forms) prabhavanti (arise/proceed) at ahar-āgame (arrival of Brahmā’s day).

rātri-āgame — arrival of cosmic night — pralīyante (they dissolve, disintegrate). The avyakta here is not the absolute Brahman, but the causal state of the universe in potential.