WHAT I have formerly said of exercise, I may now repeat of sleep. Nothing better than moderate sleep, nothing worse than it, if it be in extremes, or unseasonably used. It is a received opinion, that a melancholy man cannot sleep overmuch; Somnus supra modum prodest, as an only antidote, and nothing offends them more, or causeth this malady sooner, than waking, yet in some cases sleep may do more harm than good, in that phlegmatic, swinish, cold, and sluggish melancholy which Melancthon speaks of, that thinks of waters, sighing most part, &c. It dulls the spirits, if overmuch, and senses; fills the head full of gross humours; causeth distillations, rheums, great store of excrements in the brain, and all the other parts, as Fuchsius speaks of them, that sleep like so many dormice. Or if it be used in the day-time, upon a full stomach, the body ill-composed to rest, or after hard meats, it increaseth fearful dreams, incubus, night walking, crying out, and much unquietness; such sleep prepares the body, as one observes, "to many perilous diseases." But, as I have said, waking overmuch, is both a symptom, and an ordinary cause. "It causeth dryness of the brain, frenzy, dotage, and makes the body dry, lean, hard, and ugly to behold," as Lemnius hath it. "The temperature of the brain is corrupted by it, the humours adust, the eyes made to sink into the head, choler increased, and the whole body inflamed:" and, as may be added out of Galen 3. de sanitate tuenda, Avicenna 3. 1. "It overthrows the natural heat, it causeth crudities, hurts concoction," and what not? Not without good cause therefore Crato consil. 21, lib. 2; Hildesheim, spicel. 2, de Delir. et Mania, Jacchinus, Arculanus on Rhasis, Guianerius and Mercurialis, reckon up this overmuch waking as a principal cause.