<img src=”https://media.glamour.com/photos/5a2af80a8e93cb5cf364de09/master/pass/Arianna%20Huffington.jpg” alt=”Arianna Huffington, Founder of Thrive Global“/> Arianna Huffington, Founder of Thrive Global “At the end of the day, I make a ‘gratitude list’ by writing down a few things I’m thankful for. It lowers my stress levels and gives you a greater sense of calm at night.” Getty Images <img src=”https://media.glamour.com/photos/5a2af80b38131d7eca4660b0/master/pass/Ellen%20Pompeo.jpg” alt=”Ellen Pompeo,…