Our bodies are governed by circadian rhythms that play an important role in many physiological processes, and which depend on signals from the natural environment, especially during exposure to sunlight. Natural light is vital in regulating these Rhythms that control various body processes to maintain good psychological and physical balance.
But modern lifestyles can disrupt these important signals, with consequent consequences for sleep and a person's physical and mental health. Hence the role of the interior designer in promoting health and well-being through good design of natural lighting within residential spaces.

While artificial lighting is undoubtedly important and often necessary, there are potential negative impacts it can have, especially with regard to sleep patterns, mental health, potential health risks from constant exposure to artificial lighting, and increased environmental concerns such as increased energy consumption. And environmental pollution, made the designer strive to achieve a balance between natural and artificial lighting, by determining and knowing the location of the sun and predicting the facades of the space at the beginning of the architectural design, while exploiting various technological methods and means to attract natural lighting within the space, and regular distribution of natural lighting, which would increase the amount Natural lighting within the space and eliminating artificial lighting for most parts of the day, in order to achieve sustainable practices and reduce energy consumption.