I’ve been experimenting with caffeine from different sources and at different times of the day. I feel the effects are more noticeable/different when I change things up.

So maybe black coffee isn’t going to have an effect on your focus/creativity, but some caffeinated tea or energy drink might have an effect.

Also, I feel that having a meal or a healthy snack with the caffeine matters as well to get a noticeable impact. So just drinking coffee in the morning, with nothing else, isn’t going to give me much of a boost as compared to if I had a meal or snack with it.