Is HDL useful for Schlaf?

Is HDL useful for sleep? Current evidence does not support a direct or clinically meaningful role. HDL is a well-established cardiovascular biomarker, but its link to sleep is indirect and weak. Some observational studies report associations between low HDL and poor sleep quality or shorter sleep duration, but these findings are inconsistent and confounded by lifestyle factors (diet, exercise, stress). Sleep regulation involves complex neuroendocrine pathways (melatonin, cortisol, orexin) and genetic variants (e.g., FOXO3 for longevity), not HDL directly. Consumer tests claiming HDL predicts sleep are overstating the evidence. For improving sleep, focus on proven interventions: consistent sleep schedule, light management, and stress reduction. HDL remains useful for cardiovascular risk assessment, but not for sleep optimization. Evidence level: mixed (observational, no strong mechanistic or interventional data).