How light is important for human survival?

Light is essential for human survival as it regulates our circadian rhythms, influencing sleep patterns, hormone production, and overall health. Sunlight is a primary source of vitamin D, which is crucial for bone health and immune function. Additionally, light plays a vital role in mental well-being, as exposure to natural light can enhance mood and reduce the risk of depression. Overall, light is fundamental to physical and psychological health, making it a key factor in our survival.