#Note/Permanent #Neuroscience #Cortisol ## Introduction to Cortisol [Cortisol](https://en.wikipedia.org/wiki/Cortisol), often referred to as the "stress hormone," is a steroid hormone produced by the adrenal glands. It plays a significant role in various bodily functions, including metabolism, immune response, and stress response. ## Role in Alertness and Circadian Rhythm - **Cortisol and Wakefulness**: Cortisol levels peak in the early morning, usually around 30 minutes after waking, contributing to increased alertness. - **Cortisol Rhythm**: The diurnal (day-night) variation in cortisol levels helps regulate the circadian rhythm, aligning the body with the sleep-wake cycle. ![[cortisol cycle.png]] image source: wikipedia ## Factors Influencing Cortisol Levels - **[[The Daily Habit of Viewing Sunlight in the Morning|Light Exposure]]**: Exposure to natural sunlight in the morning can enhance cortisol production, thus aiding in wakefulness. - **[[Exercise Tracker|Physical Activity]]**: Engaging in physical activities, especially in the morning, can stimulate cortisol release and promote alertness. ## Cortisol's Impact on Health - **Balanced Levels**: Maintaining balanced cortisol levels is crucial for overall health. Chronically high or low levels can lead to various health issues, including sleep disorders.