Smell will be dispersed in the air, and the movement of molecules makes the smell diffuse. Each flavor is an independent life entity. The aroma of apples, the smell of lemon soda, the smell of cilantro on a five-yuan bowl of beef noodles on the street, the exhaust gas left by a passing car, the smell of grass in the air after the rain... Fall in love with a taste, miss a taste, and then slowly get used to it and then slowly quit it - the same is true for people. Here is the story of the insomniac Ms. Z and her friend, for you who have also suffered from insomnia.