Sleep is a naturally recurring state of our mind and body. The main characteristics of sleep are reduced consciousness, inhibited sensory activity, decreased ability to react to stimulus, and inhibition of almost all voluntary muscles (skeletal muscles). Sleep occurs in repeating periods and in two distinct modes: Rapid eye movement sleep (REM sleep) and non-rapid eye movement sleep (non-REM Sleep).
While generally people are well aware of the dangers of UV light, such as sunburn and skin cancer, the general knowledge and awareness of blue light is very small. The exception to this seems to be Japan, where the blue light awareness appears to be quite high. A few days ago, while doing some research, I came across some interesting facts related to blue light in Japan.