Master circadian clock gene.
| Genotype | Impact | What it means |
|---|---|---|
| TT (Normal) | Normal | Standard circadian rhythm - earlier chronotype tendency. Keep consistent sleep/wake times and morning daylight. |
| TC (Carrier) | Low impact | Intermediate chronotype. Anchor regular sleep hours, get morning light, and avoid late heavy meals and screens. |
| CC (Variant) | Moderate | Evening chronotype tendency - later body clock, higher risk of late eating and short sleep. Favour an earlier eating window, morning light and a consistent schedule. |
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