Why Some People Feel Sleepy After Drinking Tea or Coffee: The Science Explained

For millions of people worldwide, a morning mug of coffee or an afternoon cup of tea is the ultimate ritual for instant alertness. We rely on caffeinated hot beverages to wake our brains up, sharpen our focus, and power through demanding work deadlines. However, a surprising number of people experience the exact opposite effect. Instead of feeling energized, drinking a hot cup of tea or coffee leaves them feeling heavy-eyed, relaxed, and suddenly ready for a nap.