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People have used an immediate use of light since a lightbulb was invented. Thus, people must have adjusted themselves to a sudden change of brightness and darkness when they turn on and off a light.
However, humans have the biorhythm of the body, and the human body is closely related to the changes in environment. Light is one of the elements which have a decisive effect on biorhythm. In this regard, a sudden change from brightness to darkness has a detrimental effect on biorhythm, especially when people are falling into a sleep.
Biolamp is a good solution for optimal sleep environment by using natural material and the principle of gravity.
SUNG YOUNG LEE
Gwacheon-si, South Korea