Hamsters are nocturnal animals commonly kept as daytime pets, creating a welfare mismatch when owners expect activity during daylight hours.
Pet hamster welfare is frequently compromised by housing and handling conditions that ignore their natural biology. Hamsters forced to be active during the day experience chronic sleep disruption, and hamsters confined to small cages without adequate running wheels develop stereotypic behavior including obsessive bar-chewing. Research consistently shows hamsters prefer much larger enclosures than typically sold in pet stores.