Unlucky, red is a color between unlucky and unlucky. From the perspective of geomantic omen, red and blood are the same color. Although red objects can ward off evil spirits, they are also easy to bump into gods. It is best not to use red pillowcases. From a scientific point of view, red is bright and festive, giving the human body a feeling of excitement and fluctuating mood. In this case, the sleep time will definitely be extended.