What can go up a chimney down, but can't go down a chimney up?

Your copy and paste wouldn't work without me, I visit your home with folk you don't want to see, Usually brown, black or blue, plastic or wood, A metal grip at the top and on my side a pen loop

First five represent a space Together cover a grassy place Or help you snuggle on a couch Or in a bed, some have a pouch

I ruin mornings, interrupt meetings, and sometimes save lives.

I can take you for a spin, but I never go anywhere. I have horses that never run, music that never ends, and a circle that never breaks. I am a ride of pure nostalgia, turning round and round.