Electric blankets...Are they safe?

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Nothing is more pleasant than sleeping with a hot water bag in a cold night to keep the body warm and relax the muscles as you fall asleep. One such night as I was ready to fall asleep I thought about electric blankets, but having an electrical device over me as I sleep somehow makes me feel uneasy. Some people have reported injuries and minor burns due to overheating. So I was wondering what you think. Are they safe? Have you used them?