Answer:
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
I am enjoyed by some, despised by others. Some take me for granted, some treasure me like a gift. I last forever, unless you break me first. What am I?
I am what bring things together. Without me everything you see would be a total mass or debris everywhere.
The more you have me the less you see. Shine a light on me and I shall flee.
Send poorly behaved children to me and let them sit here.
My days are numbered. What am I?