The perfect place to store some hay and also milk some dairy on its way

I fall from the sky when the mountain wakes In silent, gray, and choking flakes. I am the tall pillar of a rich man’s vice, Until I crumble, at a heavy price.

though you know me, i’m ordinary i am one deceptive berry not fused together, though we’re friends i’m large enough to fill your hand wars waged by titans in my thrall just pick me up to make a call

Still waters hide what the ocean won’t keep, A quiet thief where the deep waters sleep. I’m not a lake nor the sea, but I’m landlocked by shore. What am I?

My first three describe a small bit of sleep, My last four a flat hand or a tropical tree, Put me together and I'm quite incendiary.