For generations, an unusual bedtime habit has quietly traveled from one household to another. Instead of reaching for medicine when nighttime leg cramps strike, some people reach for an ordinary bar of soap. They rub it lightly across their bedsheets or tuck it beneath the fitted sheet near their feet, hoping to prevent painful muscle spasms and restless nights.

The practice sounds almost unbelievable, yet personal stories have kept it alive for decades. Some people prefer lavender-scented soap, believing its gentle fragrance encourages relaxation. Others insist that even an inexpensive, unscented bar makes a difference. The appeal is obvious: the remedy is simple, affordable, and requires almost no preparation.

But there is a puzzling question behind these bedtime stories. Why would a household cleaning product possibly influence what happens inside the muscles during sleep? Scientists have not established that soap prevents cramps, and that uncertainty makes the tradition even more intriguing. One medical report, however, described patients who claimed remarkable relief after trying it.

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