I recently quit coffee after maybe 15 years. The biggest change I noticed was that on nights I didn't sleep well I would wake up with bad brain fog. That doesn'

I recently quit coffee after maybe 15 years. The biggest change I noticed was that on nights I didn't sleep well I would wake up with bad brain fog. That doesn't happen anymore since quitting. I still don't sleep great some nights but I don't feel nearly as awful as I did before. I also learned caffeine stays in my system much longer than I thought it did. I try very hard not to have any caffeine after 11am.