Answer:
I run up and down the stairs without moving
I'm not alive and yet I grow. Just put me next to where it glows. A favorite in summertime best with friends when combined
What is easy to get into but hard to get out of?
My first is second in line; I send shivers up your spine; not quite shining bright I glitter in the light.
So cold damp and dark I am. To stay you would refrain yet those who occupy me do never complain.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?