The results showed that IL-2 × moderate occupational stress (OR = 0.778, 95% CI: 0.778–0.942) and IL-2 × non-mental disorders (OR = 0.398, 95% CI: 0.398–0.468) were protective factors for the occurrence of sleep disorders when compared with high occupational stress and mental disorders (Table 7). This evidence concerns the gene IL2 and sleep disorder.