This of course varies by person. I am more or less immune to caffeine (in human concentrations), drinking all kind of coffees before going to bed (espresso, fi

This of course varies by person. I am more or less immune to caffeine (in human concentrations), drinking all kind of coffees before going to bed (espresso, filtered, turkish, ...). I noticed several times that it had the opposite effect (putting me to sleep). My brother has the same.