Patients who sleep with sudden foot stirring have the following reasons: First, nerve causes: for example, sciatic nerve pain, such as pear-shaped muscle syndrome, the sciatic nerve may be stimulated during sleep, which can cause nerve radiating pain that radiates to the feet and appears as foot stirring. Second, calcium deficiency: When calcium deficiency causes increased neuromuscular excitability, it often causes cramps and twitches in the calves and feet, so stirrups may also occur. Third, local muscle damage: for example, a large number of sports during the day caused muscle strain, muscle will appear protective contraction, spasm, so there will be cramps or foot stirring when sleeping.