Morning person & Night person

Some people are morning person and some people are night person. Some people are easy to wake up early in the morning. And, they are ready to work. But, it’s hard for another people to wake up early in the morning. So, they should wake up abruptly and rush to work, and sometimes they are late going to work. People says most Korean usually go to sleep late compared to American. In my case I usually go to sleep over midnight. And, I don’t go to sleep usually before midnight. Difference in people’s sleeping pattern is related to our genes. DNA has a certain gene which controls our biological clock, so the part of a gene causes our daily life like when to go to sleep and when to wake up. How is your sleeping pattern like?