Haha, joke is on you, that just makes me sleep even less.

Maybe on day 1. On day 100 you are simply immune to coffee and need to stop drinking coffee for 2 weeks to have any effect again.

Mate tea can also be am extra , when one is already mostly caffeine immune. Don’t know why, but it works (to a degree).

Don’t ask me, how I know.

Until your body builds up a tolerance and you need to keep drinking more and more to get the same high you used to from one cup.