This study aimed to discover the differences between some of personality disorders (paranoid personality, borderline personality, obsessive-compulsive personality) in quality of sleep, psychological hardness, and self-esteem. In addition, it defined the differences between some of the personality disorders according to different demographic variables in a sample of 240 persons (mean age 28.40 years ± 9.76). The battery of questionnaires included the personality disorder scale, the index of quality of sleep, the psychological hardness scale, and the self-esteem scale. The demographic questionnaire was used to collect the data after fulfilling the psychometric requirements of the battery. The main results of the current study were: (1) there was a positive significant correlation between the three types of personality disorders; (2) there was a significant effect of the religion variable on the personality disorders, while the influence of all demographic variables (gender, age, social and professional status, and educational level) were absent; (3) there was a negative correlation between the personality disorder and both of sleep quality and self-esteem; (4) and there was no significant differences between the three kinds of personality disorders in the quality of sleep, psychological hardiness, and self-esteem.