When one is advanced in devotional service, while sleeping he also serves Krsna. That means twenty-four hours, satatam. That depends on… Because in sleeping you also dream, so what we do during daytime we dream at night. So if one is cent percent engaged in Krsna's service, naturally he'll dream also at night. I have seen one of our intimate relative. He was a businessman, selling cloth. So in dream also he was quoting price of cloth. So that is natural. That is not unnatural. Therefore we have to practice. At the time of death, somehow or other if we quote the price of Krsna, then our life are successful. Therefore we should practice: Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare. Yam yam vapi smaran bhavam tyajaty ante kalevaram [Bg. 8.6]. If we practice Krsna, then naturally it is expected that at the time of death we remember Krsna. Then immediately we are transferred to the Krsnaloka. Immediately. Tyaktva deham punar janma naiti mam eti [Bg. 4.9]. Immediately. There is no doubt about it. Simple thing, but it requires practice.
From Srila Prabhupada's lecture on Srimad-Bhagavatam 5.5.24 — November 11, 1976, Vrndavana