Theoretically, sun exposure is conducive to our health. Sun rays accelerate metabolism making our bodies produce more carbon dioxide. The increased level of CO2 in lungs lessens our breathing and creates a strong positive impact on all functions of the body.
On a practical level, however, this situation can be different. The prolonged sun exposure causes over-heating, which stimulates over-breathing. Hyperventilation is dangerous: it hits the weakest organ or system of the body triggering various symptoms.
So, how do you determine the borderline between the sun exposure being safe and detrimental? Usually, a body indicates this by making its skin red or creating a rash but these valuable messages get removed by the usage of sunblocks.
A human body is very intelligent. Unfortunately, its language is frequently shot down in favor of comfort but by doing so we never win.