Answer:
If you look, you cannot see me. And if you see me, you cannot see anything else. I can make anything you want happen, but later everything goes back to normal. What am I?
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
I'm many people's favorite place, even though many don't remember their stay. You'll love to come but hate to leave. If you get cold, use my sleeve. What am I?
lighter than feather and softer than silk yet the strongest man in the world cannot hold me for more than a few minutes.
What loses its head in the morning but gets it back at night?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.