What role does Cortisol senken play in sleep?

Lowering cortisol plays a role in improving sleep because cortisol is a key stress hormone that regulates the sleep-wake cycle. Elevated evening cortisol levels can delay sleep onset and reduce deep sleep. Strategies to lower cortisol – such as stress management, exercise, meditation, or dietary adjustments – may therefore enhance sleep quality. However, the evidence is nuanced: acute cortisol reduction (e.g., via melatonin) shows moderate benefits, but long-term effects on sleep are not strongly established. Most studies are observational or small-scale, and cortisol is only one piece of the sleep puzzle; melatonin and adenosine are equally important. Consumer DNA tests may include SNPs related to cortisol regulation (e.g., FKBP5), but these have small effect sizes and should not replace clinical evaluation. Caveat: chronically high cortisol may indicate an underlying condition (e.g., Cushing's syndrome) requiring medical attention. In summary, lowering cortisol can support better sleep, but it is not a standalone solution.