Answer:
I may seem real but it always turns out I was never there in the first place... you only see me during a certain resting stage.
Use me to reward good behavior.
I have a frame but no pictures. I have poles but not standing up. What am I?
Born in the ocean and white as snow. When I fall back to water I disappear without a trace.
Turns me on my backs and open up my stomach. You will be the wisest of men though at start a lummox.
Two brothers we are, great burdens we bear. All day we are bitterly pressed. Yet this I will say, we are full all the day, and empty when go to rest.