Thomas Malthus：An Essay on the Principle of Population, Excerpt 126

As the necessity of sleep seems rather to depend upon the body than the mind, it does not appear how the improvement of the mind can tend very greatly to supersede this 'conspicuous infirmity'. A man who by great excitements on his mind is able to pass two or three nights without sleep, proportionably exhausts the vigour of his body, and this diminution of health and strength will soon disturb the operations of his understanding, so that by these great efforts he appears to have made no real progress whatever in superseding the necessity of this species of rest.

Source： https://www.gutenberg.org/ebooks/4239
Locator：Excerpt 126 · Verified：2026-10-19 · Verification：Short excerpt

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