Morning person or night owl — in the genes?

Explore genetic variants linked to your chronotype and natural sleep duration.

Chronotype — when in the day you are most alert — is one of the most studied behaviour-associated traits in genetics. Hundreds of variants have been linked to whether you lean morning or evening, and just as many to genetic sleep duration.

What the analysis shows

Some people wake rested at dawn while others peak at midnight — part of the difference is linked to genetic variants associated with chronotype and sleep duration. DNAHelper shows which of these variants your raw file carries and how strong the links are. The result is a statistical association — your actual sleep pattern is also shaped by work, light and habits. All analysis runs locally in your browser.

The clock genes behind morning and evening type

Chronotype is largely steered by clock genes such as PER and CRY — variants in and near these genes are repeatedly linked to morning versus evening preference in large population studies. Sleep duration has its own set of variants, often in genes regulating the nervous system.

What large population studies have shown

Studies with hundreds of thousands of participants find consistent associations between these markers and self-reported chronotype and sleep length. The effect per variant is small — it is the sum of hundreds of markers that yields a statistical signal, not a destiny.

Routine and light outweigh the variants

Shift work, light exposure, children, caffeine and plain routine shift your actual rhythm far more than any single variant. A genetic lean toward evening type does not mean you must live like a night owl.

What the result means — and does not mean

The analysis builds on the trait chronotype measurement and sleep duration trait (strong evidence strength). The associations are robust but explain a modest share of the variation — lifestyle and routine weigh more. Treat the result as an interesting piece of the puzzle, not a schedule.

Associations are statistical — they describe populations, not destinies. Read how we grade evidence in our method.

Privacy: your file never leaves the browser

You choose your raw file locally — it is parsed and analysed entirely in your browser and is not uploaded for the standard analysis. The only exception is the optional DNA Chat feature where you, after explicit consent, can share selected variants. Read the privacy policy · What happens to your DNA file?

Compatible raw files

Works with raw data exports from MyHeritage, 23andMe, AncestryDNA, FamilyTreeDNA (.txt, .csv, .zip). The download guides show exactly where to find your file with each provider — and the file formats are explained here.

Check your sleep genetics