Sunlight for the sick

"...my experience with the sick, that second only to their need of fresh air is their need of light; that, after a close room, what hurts them most is a dark room, and it is not only light but direct sun-light that they want...People think that the effect is upon the spirits only. This is by no means the case. The sun is not only a painter but a sculptor."

Florence Nightingale, Notes on Nursing, 1860