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After a discussion the topic I asked ClaudeAI for its advice for someone who wants to buy an electric mattress heater that they would sleep on top of.  This from the AI Chatbot:

Mattress Warmer Safety and Usage Guide

If you're considering using a mattress warmer (heating pads or electric blankets that go under you), here are some important things to keep in mind.

Safety Considerations

Modern mattress warmers have auto-shutoff features and overheat protection, but older models may lack these safety features. Check that yours is UL-listed or has similar safety certification. Inspect the wiring regularly for any damage, fraying, or exposed wires.

Don't use if you have reduced sensation (like from diabetes or neuropathy) since you might not notice if it gets too hot. Generally not recommended for young children, people who can't move easily, or anyone who might not be able to respond to overheating.

Health and Comfort

Prolonged heat exposure during sleep can cause mild dehydration, so stay hydrated. Some people find that while the warmth helps them fall asleep, it can disrupt sleep quality later in the night if they get too warm. Consider using it to pre-warm the bed, then turning it off or to a low setting once you're in bed.

The warmth can be soothing for muscle aches or conditions like arthritis.

Practical Tips

Many people find them quite comfortable, especially in cold climates. Just prioritize safety and listen to your body's response. ```