I recently learned that the arahant can no longer experience sloth and torpor. Does this mean that he/she will not get tired with insufficient sleep? From my own experience I know that when I don't sleep enough at night, sloth and torpor usually arise in the afternoon, making it difficult to remain mindful and concentrate. Would an arahant be able to be mindful and concentrate even with very little sleep, and wouldn't that mean that the basic need for sleep is overriden with enlightenment?
"I do not perceive even one other thing, o monks, that when developed and cultivated entails such great happiness as the mind" (AN 1.10, transl. Ven. Bhikkhu Bodhi)
"So this spiritual life, monks, does not have gain, honor, and renown for its benefit, or the attainment of moral discipline for its benefit, or the attainment of concentration for its benefit, or knowledge and vision for its benefit. But it is this unshakable liberation of mind that is the goal of this spiritual life, its heartwood, and its end," (MN 29, transl. Ven Bhikkhu Bodhi)