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Are the dawn phenomenon and cortisol awakening response the same?

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The dawn phenomenon and cortisol awakening response (CAR) are related but distinct phenomena.

While both the dawn phenomenon and cortisol awakening response involve hormonal changes in the early morning, they are not the same. The dawn phenomenon specifically relates to changes in blood glucose levels, while the cortisol awakening response is focused on the release of cortisol in response to waking and the anticipation of daily activities.

Dawn Phenomenon:

The dawn phenomenon refers to the natural increase in blood glucose levels that occurs in the early morning hours, typically between 3 a.m. and 8 a.m.

• During this time, the body releases hormones such as cortisol and growth hormone, which can lead to an increase in insulin resistance, causing blood glucose levels to rise.
• This phenomenon is commonly observed in people with diabetes, but it can also occur in individuals without diabetes.

 Cortisol Awakening Response (CAR):

 The cortisol awakening response is a natural surge in cortisol levels that occurs within the first hour after waking.

• Cortisol is a hormone that plays a role in various physiological processes, including the regulation of metabolism, immune function, and the body’s response to stress.
• The CAR is a normal and adaptive response to the anticipation of the day’s challenges and activities.