John Stuart Mill Quotes about Sleep
Both teachers and learners go to sleep at their post as soon as there is no enemy in the field.
John Stuart Mill (2008). “Utilitarianism and On Liberty: Including 'Essay on Bentham' and Selections from the Writings of Jeremy Bentham and John Austin”, p.120, John Wiley & Sons
"Principles of Political Economy". Book by John Stuart Mill, book V, chap. 2, 1848.