it depends on what breed it is, smaller hamsters might not mind because they usually move about alot of the time whereas bigger ones have a better vision of their surroundings that can lead to malting, chewing cages of bars etc.
This is a myth. it seems to be part of the Santa Mythus that the Reindeer and the jolly old elf have an added superpower of altering their size and shape so they can get down chimneys- the poem...