At dawn, the man who had finished the night shift was tired and returned home to sleep. The woman who is sleepy is groomed and ready to go to work. By the end of the night, the woman returned home, but the man began the “night owl” life. Night-time couples, like strangers under the same roof, have little chance to take a face-to-face, let alone normal sex life. However, when you work, people can’t help but make love.