Why do farmers in Spain take naps after lunch?

Answer 1

A siesta takes place when the sun is at its highest point. This is when the sun's ultraviolet radiation is at its peak at midday. Prolonged exposure to ultraviolet radiation may result in sunburn, especially if one has fair skin. Recurring overexposure to ultraviolet radiation can cause some forms of skin cancer.

The sun's infrared radiation causes high air temperatures from the midday onwards, the highest temperatures taking place in the early afternoon. High temperatures can cause fatigue or in more serious cases heat exhaustion, hyperthermia (sunstroke) anddeath.