The main reason why patients with advanced lung cancer love to sleep is because of physical weakness. Cancer is a consuming disease, and as the disease progresses, especially when lung cancer is advanced, there may be multiple metastatic lesions, which consume the human body and make patients more easily tired than normal people. In addition, some patients have undergone radiotherapy, and the side effects of radiotherapy will make their bodies even weaker, so they will feel tired more easily and want to sleep. In addition, patients with advanced lung cancer often have mood problems, and this physical and mental disease situation will often affect patients, causing them to have poor sleep quality in fact. Poor sleep quality will lead to, for example, not sleeping well at night and being sleepy all the time during the day. In short, drowsiness is a common phenomenon among patients with advanced lung cancer.