Sleep disturbance, especially insomnia, is a common complication after ischemic stroke for the patients during rehabilitation of cerebral infarction. Actually, more than half of ischemic stroke patients have insomnia complaints. Meanwhile, poor quality of sleep may greatly impede stroke rehabilitation and induce other complications. Thus, it is of importance to study the insomnia for the post-stroke patients, especially when they are during rehabilitation of cerebral infarction.