Last week, I had a cup of oolong tea in the evening, and I couldn’t fall asleep until 2 or 3 a.m. This experience made me wonder: how do coffee and tea affect our sleep? And what insights does the ancient Traditional Chinese Medicine (TCM) classic, “Huangdi Neijing (The Yellow Emperor’s Inner Canon)”, offer on the subject of sleep? In this blog, Songtao our TCM therapist, explores this everyday yet essential topic.