The provided context does not specifically address risks and limits of sleep training. In general, sleep training (e.g., for infants) is debated: methods like 'cry it out' may trigger short-term stress responses, and long-term effects on attachment and stress regulation remain unclear. Evidence is mixed – some studies show improved sleep duration, others indicate elevated cortisol. Limits include individual variability (temperament, developmental stage) and lack of long-term data. For adults, cognitive behavioral therapy for insomnia (CBT‑I) is more evidence-based, but success is not guaranteed. MyBody‑X tests (DNA, microbiome) are not validated for guiding or evaluating sleep training. Genetic tests for chronotype or sleep behavior have limited predictive value (small effect sizes, no clinical relevance). Conclusion: Sleep training should be applied individually, considering potential risks (stress, attachment); persistent sleep problems warrant medical evaluation.
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