I've been drinking ground coffee(espresso) for the last month or so. Started with one cup, graduated to two. This past week I've been feeling like I'm experiencing a return to post covid fatigue syndrome. This morning I awoke with the thought that maybe it's the coffee that's burning me out. I'm fine until 2 or 3 o'clock, and then crash hard. So today I'm back on instant, and it's not waking me up like it used to. I'll stick with it for a few days to a week and we'll just see.