Objective:To investigate the relationship between neuroticism and sleep quality,as well as the moderating effects of vagal function on this relationship.Methods:A sample of 222 college students(119 males and 103 females) were recruited to completed the NEO Five Factor Inventory-Neuroticism subscale(NEO FFI-N) and Pittsburgh sleep index(PSQI).All participants' heart rates and respiratory in period of calm and arithmetic task were collected,then a calculation was conduct to analysis the vagal tone and vagal r...