sā niśā paśyato muneḥ

ya-what; nisa-is night; sarva-all; bhutanam-of living entities; tasyam-in that; jagarti-wakeful; samyami-the self-controlled; yasyam-in which; jagrati-awake; bhutani-all beings; sa-that is; nisa-night; pasyatah-for the introspective; muneh-sage.