A sudden charley horse at 3 a.m. is one of the more miserable ways to wake up — a calf muscle locked mid-cramp, half-asleep and unable to think straight enough to stretch it out properly. A small but growing number of people swear by a specific, slightly odd fix: a quick swig of pickle juice.

It sounds like the kind of folk remedy that shouldn’t hold up to scrutiny, but a handful of small studies have actually looked into it, and the results have been surprisingly consistent — cramp relief that kicks in faster than plain water or stretching alone.

The Theory Isn’t About Hydration

For a long time, muscle cramps were blamed mainly on dehydration or electrolyte loss. Some researchers now think pickle juice works through a different mechanism entirely — the sour, vinegary taste itself may trigger a nerve reflex that interrupts the cramp signal, rather than the salt and fluid actually rehydrating the muscle in time to matter.

It’s Become a Nightstand Staple for Some

People who deal with frequent nighttime cramps have started keeping a small jar or shot-sized portion within reach, precisely because fumbling to the kitchen at 3 a.m. mid-cramp isn’t realistic. A few ounces, kept cold, at hand before bed has turned into a genuinely practical habit for the people who’ve tried it.

It’s not a cure for anything more serious, and frequent, severe cramps are worth mentioning to a doctor rather than just managing with pickle juice indefinitely. But for the occasional middle-of-the-night charley horse, it’s a cheap, low-risk trick that a growing number of people have decided is worth keeping around.