The BTBD9 gene has been linked to Restless legs syndrome. This neurological sleep/wake disorder is characterised by uncomfortable and unpleasant sensations in the legs that appear at rest, usually at night, inducing an irresistible desire to move the legs. The disorder results in nocturnal insomnia and chronic sleep deprivation. The majority of patients also have periodic limb movements in sleep, which are characterised by involuntary, highly stereotypical, regularly occurring limb movements that occur during sleep.
If you carry the GG -allele in this gene then....at this locus have been reported to be associated with susceptibility to Restless Legs Syndrome and may also be associated with Tourette Syndrome.
If you carry the A-allele in this gene, then you are more predisposed to Restless Leg Syndrome and should focus your choices on adequate iron intake. Check your iron levels regularly.