My air bed deflates slowly over time, but does not appear to leak. Why is that?

"Differences in temperature are a common cause for an air bed to fel softer. Hot air expands and old air contracts. When an air bed is is filled with warm air in the day and it cools down in the night, the air bed will feel softer. Other causes are a defective valve or old material that has become porous. In the latter case the air bed needs replacing. Contact the manufacturer in the case of a defective valve."

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