That reminds me of being in Okinawa in the military in the jungle training area there. The millipedes would come out at night after the short rains. They were harmless, but it was a little unnerving to get up at night to leave the tent to pee without your flip-flops on, because you could hear and feel the millipedes crunch under your feet as you walked. Now, the centipedes on the other hand were large predatory insects that were a force to be reckoned with, but we ran into those rarely and they tried to generally avoid you just like spiders do.
I love my floorless tents still --Mike