प्रथमे रात्रिभागे गूढपुरुषान्पश्येत् ॥ कZ_०१.१९.१८ ॥
prathame rātribhāge gūḍhapuruṣān paśyet
In the first part of the night, he should meet (review reports from) secret agents.
Night reduces visibility and social trace, improving secrecy and lowering the risk of signaling priorities to rivals.