Abstract: Objective To understand the potential categories of insomnia among medical students,analyze the factors associated with insomnia subtypes. Methods The convenience sampling method was used to select 4 425 medical students from a medical university in Xinxiang City from June to July 2022,and they were surveyed using the general information survey scale,insomnia severity index questionnaire,depression screening scale,and stress perception scale. The latent profile analysis was used to explore the subtypes of insomnia in the medical students. The mixed regression model was used to analyze predictive factors for each category. Results The medical students' insomnia severity score of M（P₂₅,P₇₅） was 1（0,4）points. There were 356（8.05%） people with insomnia,of which 319 were mild insomnia,33 were moderate insomnia,and 4 were severe insomnia. The subtypes were divided into four potential categories,namely "no insomnia group","unstable early wakefulness insomnia","early wakefulness stable trend insomnia",and "difficulty in falling asleep stable insomnia". The gender,grade,age,major,depression,and stress had a predictive effect on the different subtypes（all P<0.05）. Conclusion The insomnia subtypes of medical students can be divided into four potential categories with different influencing factors,and targeted interventions can be carried out according to the different subtypes and their influencing factors in the future to reduce the incidence of insomnia among medical students and promote their healthy physical and mental growth.

Key words: Medical students, Insomnia subtypes, Potential profile analysis, Influencing factors