The article discusses the role of cortisol in keeping people awake at night, the effects of caffeine on alertness, and the importance of iron levels. Cortisol is linked to stress and alertness, while caffeine helps in staying awake. Low iron levels can be further depleted by green tea consumption. The article discusses the role of cortisol in keeping people awake at night, the effects of caffeine on alertness, and the importance of iron levels. Cortisol is linked to stress and alertness, while caffeine helps in staying awake. Low iron levels can be further depleted by green tea consumption. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle