Green tea harm stomach and affect sleep?

Cha Yuan's green tea does not harm stomach, but helps on digestion. Green tea is categorised as "wood" （five element) and its cold nature can harm stomach, which is categorised as "earth". Cha Yuan's processing techniques eliminate the factors that cause "wood" to counteract "earth". By utilising the compatibility between "wood" and "earth", Cha Yuan's green tea becomes warm and cool, with a lasting fragrant and sweet taste.