We live in a coffee culture; most of us would say we have come to rely on tea or coffee to 'get us going' or 'keep us going' for the day. I've been doing my own experiments with this. A cup of chai tea has been my go to in the mornings. I love the taste, the ritual, the mental startup that I get from it. But after a couple of months, I always find myself sleeping lightly at night time; the caffeine overstimulates my nervous system.