Hamsters are nocturnal animals. They sleep almost all the time during the day. They stay awake at night. So I think yo should not be worried if yours sleeps most of the time.
What Is Typical Of Sleep Patterns For Hamsters?
Hamsters are nocturnal(sleeping in the day waking at night)but the might get up to get a drink of water or get some food. Some hamster types are more active then others(like dwarfs)
Do you mean bedding if so go to the vets and ask someone first