White noise or white noise is a random signal or random process with a constant power wavelength spectral density. In contrast, other noise signals that

 White noise is composed of sounds of 20-2000 Hz that the human ear can perceive, and it is a monotonous, regular sound. Scientists have found

With the popularity of mobile devices such as smartphones, many people like to listen to music before bed to help them fall asleep. There are

1. Soak feet If you want to effectively improve sleep quality and fall asleep quickly, you can properly soak your feet before going to bed,

Sleep in a quiet environment Try to create a sleeping environment that is easier to fall asleep. First of all, you need to be quiet.

  In recent years, with the acceleration of the pace of life and the increase of social pressure, sleep problems have become a hot topic

8. America Americans pay great attention to the pattern and color of product packaging. Their favorite pattern is the eagle (national bird), followed by butterflies

5. European market The European region attaches great importance to the quality of packaging, and they believe that high-end products should have high-end packaging. Western

Fourth, the preferences and taboos of patterns and colors in various South American countries and regions 1. Brazil Brazil: Brazilians have a good impression of