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flag Study finds cortisol levels rise before waking, linked to body's clock, not just waking stress.

flag A new study from the University of Bristol challenges the idea that the "stress hormone" cortisol spikes only when we wake up. flag Researchers found cortisol levels rise before waking, suggesting a link to our body's internal clock rather than stress from waking. flag The study, which measured cortisol in over 200 people, shows that cortisol levels are influenced more by our body's natural daily rhythm than by the act of waking up itself.

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