Galen — Sleep and Waking
The fourth non-natural — sleep and waking. Galen on sleep as the great restorer, governed by moderation and regularity, and its striking agreement with modern sleep science and 起居有常.
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Galen — The Art of Preserving Health
Galen's On the Preservation of Health (c. 175 CE) — the founding Western text of preventive regimen, built on the modifiable 'non-naturals,' and the deepest Western root of the same art the East calls yangsheng.
Galen — The Six Non-Naturals and Moderation
Galen's complete framework of preventive health — the six modifiable factors of daily life — and the master rule that governs them all: moderation, since too much or too little of anything breeds disease.
Galen — Air and Environment
The first non-natural — air and environment, which Galen called the first condition of health. Why the air we breathe and the places we live shape our well-being, confirmed by modern science.