What role does Insulin play in Schlaf?

Insulin plays a complex but often underestimated role in sleep. It regulates blood glucose, and fluctuations can directly affect sleep: nocturnal hypoglycemia triggers stress hormones like cortisol and adrenaline, leading to awakenings, night sweats, and nightmares. Conversely, sleep deprivation impairs insulin sensitivity—even a single night of 4–5 hours of sleep can reduce insulin action by 20–30%. Chronic poor sleep thus promotes insulin resistance, increasing the risk of type 2 diabetes and metabolic syndrome. Insulin also interacts with the circadian rhythm: its secretion follows a daily pattern, and disruptions (e.g., shift work) can derail glucose metabolism. Sleep architecture is influenced as well: high insulin release in the first half of the night promotes deep sleep, while late high-glycemic meals can disturb REM sleep. Evidence comes mainly from human observational studies and mechanistic experiments; long-term randomized trials are lacking. Important: insulin is not a harmless supplement—self-medication is dangerous. Anyone experiencing sleep issues linked to metabolic problems should consult a physician.