Little coffee fact for you. The longer the water spends in the grinds, the more caffeine will be infused. People think espresso is high in caffeine - but it's not, because the water is pumped through the ground beans in seconds, resulting in a rich flavour with less caffeine than drip or pressed.
I make cappuccino every morning. I have a Breville espresso machine (small) and it is one of my favourite things to have two cappuccinos snuggled in bed with my sweet dog. I only drink two and only in the morning and have no issues with that amount of caffeine.
So, if you can, I'd highly recommend you buy yourself an espresso machine.
CF