Sublime

The administrator made a particular point of showing Luo Ji a set of light switches in the room, each of which bore a small picture of the sun. The administrator called them “sun lamps” and said they needed to be turned on for no fewer than five hours a day. Originally intended as labor-safety products for mine workers, they could simulate

The body clock is most responsive to sunlight in the early morning, between 6:00 a.m. and 8:30 a.m. Exposure to sunlight later is still beneficial but doesn’t provide the same benefit.

“Nonsmokers who avoided sun exposure had a life expectancy similar to smokers in the highest sun exposure group, indicating that avoidance of sun exposure is a risk factor for death of a similar magnitude as smoking.”