IgG Unverträglichkeitstest: can a DNA test help?

A DNA test can suggest a genetic predisposition for a 'night owl' chronotype, but the effect is small (10–25 minutes shift). Adolescents naturally experience a phase delay, so late-night training may further shorten sleep. Your son's exhaustion is more likely due to sleep debt than a single gene variant. DNA tests are not diagnostic and should not replace medical advice. Instead, I recommend tracking sleep duration with a wearable (aim for 8–9 hours), reducing evening light exposure, and adjusting training schedules if possible. Evidence for individual chronotype genes is moderate; lifestyle factors dominate.