rs4780805: Sleep Duration and Genetic Variation
The genetic variant rs4780805 is a single nucleotide polymorphism located in an intergenic region on chromosome 16. Genome-wide association research has evaluated this marker for subtle statistical correlations with habitual sleep duration across population cohorts. Overall evidence for its independent influence remains limited, reflecting the highly polygenic and environmentally modulated nature of human sleep habits.
What each genotype means
Typical sleep duration profile
This genotype represents the major allele combination for this variant. Research indicates this variant is associated with usual sleep duration, but the effect size is small and the evidence is limited. This result should not be used to make health decisions or medical assumptions.
Carried by the majority of individuals in most populations, though frequencies vary by ancestry.
Associated with sleep duration
Carrying one copy of the C allele has been identified in large-scale studies as being associated with variations in usual sleep duration. Because this association is based on statistical trends across large populations, it does not predict an individual's specific sleep habits. Please consult a sleep specialist if you have concerns about your sleep quality or duration.
Carried by roughly 1 in 3 to 1 in 4 people of European ancestry, based on a minor allele frequency of approximately 0.18 to 0.25.
Associated with sleep duration
Carrying two copies of the C allele is associated with variations in usual sleep duration in multi-cohort genetic studies. This association is statistical in nature and does not account for the many environmental and lifestyle factors that influence sleep. This information is for educational purposes and should not be used for medical diagnosis.
Carried by approximately 3% to 6% of individuals of European ancestry, based on reported minor allele frequencies.
Genomic Location and Characteristics
The single nucleotide polymorphism designated as rs4780805 is situated on human chromosome 16. It is categorized as an intergenic variant, meaning it resides in a non-coding genomic stretch between annotated protein-coding genes. In early sleep duration genome-wide association studies, it was mapped in the vicinity of the transmembrane channel-like gene family, sitting roughly 17 kilobases away from the nearest protein-coding sequence. Because it does not alter an amino acid sequence directly within a gene, any biological function it exerts would theoretically stem from regulatory mechanisms, such as modulating long-range chromatin architecture, enhancer activity, or transcript expression of adjacent genes. However, precise molecular mechanisms connecting this locus to cellular sleep pathways have not been definitively confirmed in laboratory assays.
Scientific Evidence and Sleep Duration Associations
Usual sleep duration is a complex polygenic trait influenced by circadian timing, homeostatic sleep pressure, and numerous environmental factors. In discovery analyses examining sleep habits across multi-cohort samples, rs4780805 emerged as a top candidate marker associated with variations in typical nightly sleep time. Subsequent large-scale genetic investigations, including massive biobank-scale meta-analyses, have demonstrated that overall sleep duration is driven by thousands of common loci with very small individual effect sizes, alongside major signals near genes like PAX8 and VRK2. Because early associations for rs4780805 demonstrated nominal or sub-genome-wide significance depending on cohort size, statistical evidence for rs4780805 is classified as limited. It captures slight population-level differences in nightly rest rather than acting as a deterministic switch for sleep duration.
What You Can and Cannot Conclude
Discovering your genotype at rs4780805 provides educational insight into human genetic architecture, but it cannot be used as a clinical assessment or personal diagnostic tool. The variant explains only an extremely tiny fraction of a minute of nightly sleep variation, which is vastly overshadowed by routine environmental exposures, shift work, stress, diet, screen use, and sleep hygiene. Carrying a specific allele at rs4780805 does not imply you have insomnia, hypersomnia, or a circadian rhythm disorder. Consequently, this genetic information should never guide changes to sleep medications, supplements, or medical treatment plans. Individuals struggling with daytime fatigue, sleep deprivation, or persistent disruption should focus on evidence-based sleep routines and consult a board-certified sleep specialist or healthcare professional.
How common is this variant?
The minor C allele of rs4780805 occurs at a frequency of approximately 18% to 25% in European ancestry populations, with the majority of individuals carrying the homozygous TT genotype.
Frequently asked questions
Does having rs4780805 mean I will sleep less or more?
No. While research studies observe subtle statistical differences in average sleep duration across large groups of people, the impact of a single variant like rs4780805 is too minute to determine an individual's personal nightly sleep hours.
Is rs4780805 linked to sleep disorders like insomnia or sleep apnea?
Current research connects this variant only to modest population shifts in self-reported usual sleep duration, not to medical conditions like obstructive sleep apnea, narcolepsy, or chronic insomnia.
Can I use my rs4780805 genotype to change my sleep schedule?
No, your genotype at this single marker should not dictate when you go to bed or wake up. Daily lifestyle, light exposure, work schedules, and general sleep hygiene exert far greater influence on healthy rest than individual genetic variants.
Why is the evidence for rs4780805 rated as limited?
The variant was identified as a significant signal in early multi-cohort sleep habit analyses, but massive subsequent studies show that sleep duration is shaped by countless small-effect loci, meaning rs4780805 lacks standalone predictive power.
Sources & further reading
Educational information only, last refreshed 9/8/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant is an uncharacterized single nucleotide variation with no established clinical significance.
This variant is an uncharacterized single nucleotide variation with no established clinical significance.
This variant is an uncharacterized single nucleotide variation with no established clinical significance.
This variant is an uncharacterized single nucleotide variation with no established clinical significance.
This variant is an uncharacterized single nucleotide variation with no established clinical significance.
This rsID is not currently recognized as a valid, stable SNP in major public databases like dbSNP or Ensembl.