Sudden twitching and waking up while sleeping, there are more reasons for this symptom, and precise analysis is needed to come up with a diagnosis of the disease, as follows: 1. Long car rides: long car rides, bumps, and maintaining the same posture will trigger the symptoms of sudden cramps and awakening of the feet when sleeping; 4, disease factors: such as acute seizures of epilepsy; 5, electrolyte disorders: such as patients with hypocalcemia, nerve excitability will be higher, which will trigger the symptoms of sudden cramps and awakening of the feet when sleeping.