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I have always wondered why we feel at our worst in the morning and better in the evening. I have been looking around and here is the reason. It is the cortisol which is the stress hormone.
Shortly after awakening, a sharp 38–75% (average 50%) increase occurs in the blood level of cortisol in about 77% of healthy adults, and it occurs in people of all ages. The average level of salivary cortisol upon waking is roughly 15 nmol/l; 30 minutes later it may be 23 nmol/l, though there are wide variations. The cortisol awakening response reaches a maximum approximately 30 minutes after awakening though it may still be heightened by 34% an hour after waking. The pattern of this response to waking is relatively stable for any individual.
Normally, the highest cortisol secretion happens in the second half of the night with peak cortisol production occurring in the early morning. Following this, cortisol levels decline throughout the day with lowest levels during the ?rst half of the night.
There is more info on Wiki if you want to read. Check out foods that are good for lowering cortisol - also green tea is apparently good. Maybe it helps just to know why even if we can't stop it.
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