What do studies say about Schlaf Alltag?

Research shows that sleep plays a fundamental role in physical and mental health. Adequate, high-quality sleep (7–9 hours for adults) improves cognitive function, memory consolidation, emotional stability, and immune defense. Chronic sleep deprivation is associated with increased risk of cardiovascular disease, type 2 diabetes, obesity, and reduced life expectancy. Circadian rhythms regulate hormones like melatonin and cortisol; disruptions from shift work or irregular sleep schedules can derail metabolism. Genetic factors (e.g., PER3, CLOCK) influence individual sleep propensity, but effects are small and polygenic. Direct-to-consumer DNA tests rarely provide clinically valid actionable advice for daily sleep. Instead, consistent bedtimes, reduced screen time before sleep, avoidance of evening caffeine, and stress management are evidence-based measures. The evidence for these lifestyle recommendations is strong (numerous randomized trials and meta-analyses). Single-gene analyses do not replace medical sleep diagnostics (e.g., for sleep apnea).