I drink coffee but it's just because I like it. I don't drink milk so I use a non-dairy creamer plus Stevia for sweetener. I probably drink three to four cups a day. Never in the evenings, though. It might give me a little more energy.....I've never stopped to see if I feel more tired without it. But I can still fall asleep at night.

When I do try something that's darker or has more caffeine in it I can tell. I get antsy and shaky.