"How is it that ideas ripen in the mind, so that a man shall go to bed with a very imperfect possession of what he has laboured to get by heart, and shall awake in the morning able to repeat it with distinctness and facility?"
— Boswell, James (1740-1795)
(p. 158 in London Magazine)
See also James Boswell, The Hypochondriack, ed. Margery Bailey, 2 vols. (Stanford UP, 1928).