{{Genotype
|rsid=121908635
|allele1=A
|allele2=G
|magnitude=4
|repute=Mixed
|summary=Morning Lark (people waking up very early)
}}

This variant is associated with people who have a sleep disorder known as Familial Advanced Sleep Phase sydrome (FASPS). This is associated with a 4-hour advance of their sleep, temperature, and melatonin rhythms, including going to bed and waking up that much earlier on average.