Eating, sleeping, mating, and defending, they should be reduced, and come to the point, no sleeping, no eating. Just like Raghunatha dasa Gosvami. He came to that point, no sleeping, no eating. All the Gosvamis, they were not sleeping more than two hours. So why about Gosvamis? Even big karmis, like Subash Bose, Gandhi, they were also not sleeping. I heard that Napoleon Bonaparte, he was not sleeping. When he was passing from one warfield to another, on his horse he slept. That's all. He never went to the bedroom for sleeping. Gandhi used to do that. He would sleep when he was passing from one station, one… In the motorcar he would sleep. Then again he will begin work.

From Srila Prabhupada's lecture on Srimad-Bhagavatam 6.3.18 — Gorakhpur, February 11, 1971