Normally, bedding.They can sleep on or in bedding. But they do like to burry so you could get it paper shreddings
there is no specific time.
Yes
hamster tumors are just the same as a humans. When you start to feel small or large bumps on a hamster you will know that its a sign and you should immediately take your hamster to the vet, and they will see what they can do, or if your hamster is in pain, they can put your hamster to sleep humanely.
First one!
yes
Dwarf hamsters - each other and on suitable hamster bedding. Syrian - on their own and on suitable hamster bedding.
If you don't mind the possibility of the hamster waking you up by running on its wheel or doing other activities during the night you should be fine. On the other hand if you are a light sleeper and need sleep you might not want to do this. Yes though, it is probably fine to let your hamster sleep in the same room as you.
They will make a nest out of the bedding you put in the cage.
NO hamsters are nocturnal so they sleep in the day and play in the night
My hamster is nocturnal but I think babies sleep more than adults:)
yes because were would it sleep
they might simply be sick.