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Background and Objective This study aimed to examine psychometric properties of the Korean Ford Insomnia Response to Stress Test (K-FIRST). The FIRST measures personal vulnerability of sleep difficulties in response to stressful events. Methods 377 participants (mean age = 21.80 ± 2.91 years, 76.9% female) completed online surveys about demographic information, sleep reactivity (K-FIRST), insomnia (Insomnia Severity Index, ISI), perceived stress (Perceived Stress Scale, PSS), and depression (Center for Epidemiological Studies-Depression Scale, CES-D). Exploratory factor analysis was conducted to determine the factor structure of the K-FIRST. Results K-FIRST showed adequate internal consistency (Cronbach’s α = 0.85) and significant goodness of fit test result (χ2 = 1386.33, p < 0.001). A two-factor structure was selected as a result of the factorial analysis, with rumination and worry as the two factors. K-FIRST was significantly associated with the ISI (r = 0.35, p < 0.01), PSS (r = 0.30, p < 0.01), and CES-D (r = 0.42, p < 0.01). Conclusions The results of this present study supported the reliability and validity of K-FIRST. It is expected that the K-FIRST can be used in future research in investigating personal vulnerabilities that may predispose individuals to sleep disturbance.