Night for the beings is the time of awakening for the self controlled and time of awakening for the beings is the night for the introspective sage. Yes, Srila Prabhupada explains that there are two classes of intelligent men, one who is intelligent in material activities and make plans for his sense pleasure. Although he is materially awake, he is sleeping spiritually. Therefore, when material persons are awake, for the self controlled, its night as devotees are materially sleeping. They have no dealings with sense gratification, they are only concerned with Krishna's satisfaction. And when that introspective sage is awakened, it is night for the people because they are spiritually sleeping. In such a deep slumber, they see dreams of sense pleasure and sometimes feel happiness and sometimes distress.
