I drink coffee. About 2 cups per day (single espresso or batch brew). The third one makes me depressed at evening. When I stop drinkimg coffee I realise that my

I drink coffee. About 2 cups per day (single espresso or batch brew). The third one makes me depressed at evening. When I stop drinkimg coffee I realise that my energy curve throughout the day is flatter and I also sleep better and dream more vividly. I know that Im sensitive to substances, but could not google anything in regards to this. Also, Ive stopped, but I love the ups the caffeine gives me, without being able to consider the longterm downs.