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Many people have the habit of sleeping while switching on the light .However, the scientific research shows that human can not easily sleep deeply under the bright light. By doing this, they actually can not have a good rest, and also it is a waste of energy.
This is a type of lamp, which is used before sleeping. The main body of the lamp is made as a slider. It is fixed on a board,which has a scale. Pushing the slider to the desired time length of lightness before sleeping. The slider will slip down slowly and at the same time the light is truing darker, and then finally it will be turned off.