THEY WILL START STAYING IN THERE HOUSE MORE AND SLEEPING
My hamster did the same. I know why. You need to let her run free for a while. She feels locked in a prison and she wants to run around for a bit. Buy a hamster ball and let her run around in it. This is so much more amusing than the television...
When your hamster feels heavy that may mean she is putting weight to stay on your hand or ground but when they are in air or being accidentally droped they reduce the weight and become lighter to reduce the chance of fall damage.
You should have a small dish tray. Just put food on the dish tray and the hamster will eat when he/she feels like it.
A hamster will move its ears back when it feels threatened or is scared. This is one way of determining the mood of your hamster.
It depends on the hamster, so i dont know.
What is a hamster that has no legs called? A furball.
you get it
Ask yourself one key question: "Do I want a hamster?" If the answer is yes, then any hamster will do.
a hamster doesnt know how to swim this is all i know soz
you will have to ask the person who sold you the hamster that is the only way.
If you see the hamster looking and nibbling for a place to get out, then they want to get out. I found this answer because my own hamster escaped. 
If he bites you.