Sleep start is also associated with one SNP at gene CYP7B1 related to BMI, two SNPs near gene HSD17B12 related to BMI [25, 30, 31], two SNPs near MIR129-2 also related to BMI [25, 26] and Alzheimer’s Disease [32], and two SNPs near LOC101928944 related to schizophrenia [33, 34]. This evidence concerns the gene CYP7B1 and Alzheimer disease.