**5. Conclusions**


the homozygous genotype 10/10 is more common (54.8%), whereas the heterozygous genotype 9/10 was less common (36.6%). Genotype 9/9 was observed in 3.7%. The incidence of other genotypes was 1.7% or less. Genotype 4/ 6 of the *DRD4* gene and genotype 9/9 of the *DAT* gene were significantly associated with sleep disorders.

