When do muscle spasms typically occur?

Muscle spasms often occur at the time of injury because they are a physiological response to trauma. When a muscle is injured, the body signals the affected area to tighten in an attempt to protect it from further damage. This involuntary contraction can manifest as a spasm, which serves as a defense mechanism, limiting movement and allowing for healing. While spasms can indeed happen at other times, such as after strenuous exercise or during sleep, the immediate occurrence during an injury is a critical response facilitating a protective mechanism in the body.