I haven't been tested but I read about this, and I think I may have something similar. One cup of cold-brew coffee and I'm good for the day. I don't start getti

I haven't been tested but I read about this, and I think I may have something similar. One cup of cold-brew coffee and I'm good for the day. I don't start getting caffeine withdrawal symptoms (headache etc.) until mid-day the next day. I used to drink caffeinated soda throughout the day, quitting around 5 hours before bedtime, and I had constant sleep issues. I stopped that around 10 years ago and switched to my one-cup-per-day system. Now I sleep fine.