As early winter cold arrives, more people are turning on electric blankets or heated water mattress pads before bed. While these heating products are considered winter essentials for quickly warming cold bedding, medical experts warn they may actually disrupt quality sleep if used throughout the night.
Body temperature regulation is considered a key factor for quality sleep. According to medical experts, the body's core temperature needs to drop by approximately 1 to 1.5 degrees Celsius below normal levels to enter deep sleep, and when this temperature decrease occurs smoothly, the brain naturally transitions into sleep mode.
However, falling asleep with an electric blanket or heated water mattress pad turned on keeps body temperature elevated, delaying sleep onset and increasing the likelihood of light sleep and repeated awakenings. Research by neuroscience professor Matthew Walker's team at the University of California also found that when core body temperature does not drop sufficiently during sleep, the brain has difficulty entering deep sleep stages.
When physiological mechanisms work excessively to lower body temperature, sweating increases, raising dehydration risks. This often results in morning fatigue rather than feeling refreshed. Analysts also note that disrupted sleep continuity can lead to frequent early-morning awakenings.
Safety concerns should not be overlooked either. Low-temperature burns caused by electric blankets and heated water mattress pads occur from prolonged exposure to relatively low temperatures of approximately 40 to 70 degrees Celsius. Because these burns are nearly painless, damage is often discovered only after significant progression. Some low-temperature burn patients have reportedly required skin grafts due to damage extending to the dermis layer. Diabetic patients face particularly elevated risks due to reduced sensory nerve function.
Experts advise that while there is no need to completely avoid heating products, special attention to usage methods is necessary. They recommend using these products to warm bedding before sleep but turning off the power just before falling asleep to promote quality rest. Keeping the temperature setting below 40 degrees Celsius is also recommended for safety.
To prevent low-temperature burns, placing a layer of blanket over the electric blanket or heated water mattress pad is advisable to prevent direct skin contact with heat. Regularly checking for skin discoloration, tingling, or reduced sensation in areas touching the pad is also necessary. Since temperature controllers emit relatively higher levels of electromagnetic waves, placing them as far from the head as possible, toward the feet, is recommended. Heated mattress pads should also be positioned below shoulder level.
Medical experts suggest that for quality sleep, rather than trying to maintain warmth for extended periods, turning off the power just before sleep and creating an environment that allows body temperature to naturally decrease is more effective.
