In ancient times, there were calligraphers who practiced calligraphy late at night.
Relevant historical data prove that there were ancient calligraphers practicing calligraphy at night.
For example, Zhong Yao was born in the late Eastern Han Dynasty. He was very dedicated and enthusiastic about the study of calligraphy, almost to the point of madness. It is said that he once studied in Baodu Mountain. In order to practice calligraphy well, he wrote all the rocks and trees in the mountain black. Once, he was discussing calligraphy brushes with Cao Cao, Wei Dan and others. He was so interested that he kept copying the drawings before going to bed, and even cut several holes in the quilt.