contemporary culprits is the improper management of indoor climate control. Sleeping with an air conditioning unit set to an excessively low temperature—or positioning your bed directly beneath a continuous, downward stream of cold air—can cool the skin surface dramatically over several hours.
Because your metabolic rate naturally drops and your core body temperature lowers slightly during deep sleep cycles, your extremities become highly vulnerable to external temperature drops. A continuous chilly draft blowing over an exposed hand resting outside the blankets is often all it takes to activate a localized
