Also incase it gets overlooked and assuming that those caffeine pills have no sugar/protein: If your coffee has sugar you may notice the drop in sugar. If it h

Also incase it gets overlooked and assuming that those caffeine pills have no sugar/protein: If your coffee has sugar you may notice the drop in sugar. If it has protein then this can greatly change the effect of the caffeine (the amino acids tyrosine+phenyalanine are required for adrenaline synthesis for example)