Light doesn’t just help us see. In addition to influencing our general well-being, it is also an important means of regulating our biological clock. Light influences our sleep, concentration, productivity, dynamism and health.
Scientific studies have shown that light has a biological effect on our body. Ultraviolet light, for example, influences the production of vitamins. Exposure to bright light, and in particular blue light, affects our hormonal balance. The body’s hormones regulate how a person feels and how they sleep-wake cycle. During the day, blue light is relatively high, while it is much lower in the evening.
When it is very bright outside, the body releases serotonin, also known as the ‘happy hormone’, and cortisol, the stress hormone. These two hormones make us feel dynamic and active. Melatonin, however, is considered to be the sleep hormone because it makes us feel tired and helps us to sleep soundly when it is dark.
Light, especially blue light, reaching the retina also affects our psychological well-being. This is why light therapy is successfully used to treat winter depression and insomnia. But, as is often the case, the rule of moderation should be applied. Excessive exposure to light also carries certain risks and can even be harmful.