Why it works is not entirely clear, but previous animal studies suggest it may increase the amount of calories burned in brown fat tissue. (alivebynature.com)
Sleeping in a colder room boosts the body's creation of brown fat tissue which is a type of fat that burns calories. (fitnessandpower.com)
The cold activates to growth brown fat tissue, which has positive issue for fight against obesity. (stubbornfatdone.com)