“When I have been compell’d to sit up all Night about some extraordinary Business, I needed to do no more than to take some of this Tea, when I perceiv’d my self beginning to sleep, and I could easily watch all Night without winking; and in the Morning I was as fresh as if I had slept my ordinary time; this I could do once a week without any trouble. [Quoting Dr. William Chamberlayne (1619–89), English physician and poet, in his Treatise of Tea.]” SleepMedicineTeaCaffeine Book:The World of Caffeine Source: The World of Caffeine