condensation

So i've done my first winter(ish) camp out, in a bog standard 2 man tent. I DIY'd a ground mat from reflective packaging, a yoga mat, a wool blanket and down duvet, and put my fesca sleeping bag on top. wonderful night's sleep, blissful. I was struck by the level of condensation that built up...

Does anyone know if sil-nylon tarps lose their waterproofness with time? My tarp started dripping on the inside in quite a few spots right across the tarp that made me think it was less about the condensation than it could be the rain coming through. It was very wet but there was a strong wind...