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Sleep & Stress1 min read

How Cortisol Disrupts Sleep and What the Evidence Suggests

Cortisol follows a precise circadian rhythm, and when that rhythm is distorted by chronic stress, the result can be fragmented sleep, early-morning waking, and a self-reinforcing cycle of hormonal dysregulation. Understanding the mechanisms behind this disruption points toward practical, evidence-informed strategies for restoring normal sleep architecture.

Wie Cortisol den Schlaf stört und was die Evidenz nahelegtCreated with AI

The relationship between cortisol and sleep is not incidental. Cortisol is a hormone with a tightly programmed daily rhythm, and when that rhythm is thrown off, the consequences reach into nearly every aspect of metabolic and neurological health. For many people, the experience of waking at 2 or 3 in the morning, alert and unable to return to sleep, may be a direct expression of this hormonal dysregulation rather than a simple behavioral problem.

Cortisol's Circadian Architecture and Why It Matters for SleepCreated with AI

Cortisol's Circadian Architecture and Why It Matters for Sleep

Cortisol does not sit at a fixed level throughout the day. According to Thomas DeLauer, it follows a circadian curve, rising gradually from around 2am and peaking approximately 30 minutes after waking. This morning surge is a normal and necessary physiological event, providing the alerting signal that helps the body transition from sleep to wakefulness. The evening, by contrast, should represent the trough of this curve, when cortisol falls low enough to allow the parasympathetic nervous system to dominate and sleep to begin.

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