I think my size probably helps my caffeine tolerance. You're what, 20+ kg lighter?
I accidentally took 2g of caffeine instead of 200mg (don't fuck about with caffeine powder, kids!) before a turbo session before going out to dinner and it didn't even appear to impact my sleep.
Took a litre and a half to an all night movie marathon, had to stop on the ride home as my heart felt like it was going much too fast!