Can Cortisol senken help with sleep?

Whether lowering cortisol can improve sleep is not clearly supported by strong evidence. Cortisol follows a circadian rhythm: high in the morning, low at night. Chronically elevated cortisol – due to stress, poor sleep, or medical conditions – is associated with difficulty falling asleep and reduced sleep quality. In theory, reducing cortisol (e.g., via stress management, meditation, exercise, or adequate sleep) could benefit sleep. However, the evidence is mixed: most studies are observational, and direct cortisol-lowering interventions (e.g., supplements like ashwagandha or phosphatidylserine) show inconsistent results. Direct-to-consumer tests measuring cortisol in saliva or blood are limited by diurnal variation and may not reflect long-term status. Importantly, cortisol is essential for health; indiscriminate lowering can be harmful. For persistent sleep issues, consult a doctor to rule out underlying conditions like thyroid disorders or depression. Evidence grade: mixed/unclear.