Sleep problems have become a common health problem nowadays, and researches on sleep disorders have become a hot topic. Polysomnography (PSG) is the most commonly used method of sleep monitoring in sleep research, but its operation process is cumbersome and complicated, which is likely to ca"first night effect", affecting the compliance of the subjects and the reliability of the monitoring results. In 2005, the cardiopulmonary coupling (CPC) technique based on electrocardiogram signals was used for sleep assessment for the first time, and now it has been widely used in sleep monitoring and analysis of patients with sleep apnea syndrome, sleep disorders, insomnia, depression or other sleep-related diseases and the healthy people, to some extent making up for the lack of traditional PSG technology. It has the advantages of simplifying the operation and improving the sensitivity of the information effectively. However, CPC technique also has the limitations in target crowd, function and use, which can be improvedthe developments of CPC algorithm and the cross-system integration of nerve in the future.