Nocturnal leg cramps, often called charley horses, are sudden and painful muscle contractions that usually affect the calves, though they can also occur in the feet or thighs. These cramps tend to happen while you are resting, most commonly during sleep, and can last from a few seconds up to ten minutes. Although the pain can feel intense and alarming, they are generally harmless and resolve on their own.

Many people experience being abruptly awakened by a sharp, tightening sensation in the leg. The pain is often described as a deep knot in the muscle, forcing you to sit up, stretch, or massage the area for relief. Even after the cramp subsides, the muscle may remain sore or tender for hours or even days, making movement uncomfortable.

These cramps are quite common across all age groups. Studies suggest that up to 60 percent of adults will experience them at some point, with frequency increasing after the age of 50. Older adults, in particular, may deal with recurring episodes that disrupt sleep and affect overall well-being.

Younger individuals are not exempt either. Research indicates that around 40 percent of children and teenagers may occasionally experience nighttime leg cramps. For some, these episodes are rare and may follow physical exertion, dehydration, or long periods of inactivity.

For others, however, the cramps can become a regular issue, interfering with sleep and leading to fatigue or anxiety about bedtime. While typically not serious, frequent or severe cramps may benefit from lifestyle adjustments or medical evaluation to identify underlying causes.