How are Cortisol and Schlaf related?

Cortisol and sleep are closely linked. Cortisol, the primary stress hormone, follows a circadian rhythm: levels peak in the morning and decline throughout the day, reaching a nadir at night. This rhythm is essential for healthy sleep. Chronically elevated cortisol – due to ongoing stress – can impair sleep quality by making it harder to fall asleep and reducing deep sleep. Conversely, sleep deprivation can raise cortisol the next day, creating a vicious cycle. The evidence for this relationship is strong (human-strong), based on extensive clinical and physiological research. However, no specific sources are provided in the given context. Maintaining a healthy sleep-wake cycle and managing stress are therefore key strategies for regulating cortisol levels.