O caso do chá vermelho (pu-erh)

Pu-erh teas are low in tannins and have a rich, unique earthy flavor and handles multiple steepings without losing flavor. According to scientific studies Pu-erh teas have many health benefits. Pu-erh Tea is the perfect tea after a heavy meal, it helps relieve any indigestion and aids in the digestion of fatty foods. Pu-erh Tea cleanses the blood, lowers cholesterol and triglycerides, help with weight control and is also known to help a hangover or two. [daqui]

Isto é tudo muito bonito mas, quanto a este, que não restem dúvidas: insónia garantida!