The occasional nighttime calf cramp is usually more painful than dangerous.
But recurring episodes are worth paying attention to because they can interfere with sleep and, in some cases, may be related to medication, nerve problems, circulation issues, or another health condition.
The goal is not to panic every time a muscle tightens. It is to recognize when the pattern has changed.
## The Bottom Line
Nighttime leg cramps are sudden muscle contractions that commonly affect the calves, feet, and thighs. Muscle fatigue, prolonged positioning, age, some medications, and certain medical
