People have been rubbing a bar of soap across their bedsheets for generations, even though it sounds unusual at first. The most common reason is to help with nighttime leg cramps or restless legs. The method is simple: some people lightly rub a dry bar across the fitted sheet, while others place it underneath the sheet near their feet before going to sleep.

The idea has become one of those old-fashioned household remedies passed down through families. Some people believe the soap’s scent or ingredients somehow help relax their legs, while others think the routine itself creates a calming sensation before bedtime. Lavender soap is especially popular because its fragrance can feel soothing, while others prefer plain, unscented soap. Although there is no strong scientific evidence proving that soap prevents cramps, many people still swear by the trick.