If you're using a heatingpad, for safety's sake, be careful not to fall asleep with that electric pad nestled against your ear.
如果你用加热垫，为了安全，小心不要在电热垫靠着你耳朵时睡着了。
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If your body is naturally cool or your circulation isn't the best, add an extra layer of heat from an electric blanket, heatingpad or hot water bottle before going to bed.