Institutio Oratoria

Demosthenes took a wiser view; for he would retire to a place [*]( An underground room. See Plut. Dem. vii. ) where no voice was to be heard, and no prospect greeted the sight, for fear that his eyes might force his mind to neglect its duty. Therefore, let the burner of the midnight oil seclude himself in the silence of night, within closed doors, with but a solitary lamp to light his labours.

But for every kind of study, and more especially for night work, good health and its chief source, simple living, are essential; for we have fallen into the habit of devoting to relentless labour the hour which nature has appointed for rest and relaxation. From those hours we must take only such time as is superfluous for sleep, and will not be missed.

For fatigue will make us careless in writing, and the hours of daylight are amply sufficient for one who has no other distractions. It is only the busy man who is driven to encroach on the hours of darkness. Nevertheless, night work, so long as we come to it fiesh and untired, provides by far the best form of privacy.