Sleep and dream. What's going on?

Sleep has been dreaming, considering the poor quality of sleep, common cause is insomnia. Insomnia is to fall asleep and (or) sleep maintenance difficulties caused by the quality or quantity of sleep can not reach the normal physiological needs and affect the social function of a subjective experience during the day, is the most common sleep disorder disease, the prevalence of insomnia is very high. Clinical manifestations of insomnia patients complain of insomnia symptoms and symptoms of impaired social function. First, the patient complained of difficulty falling asleep, bed for 30 minutes did not fall asleep, easy to wake up, frequent awakening, wake up more than twice a night, multiple dreams, wake up early or fall asleep again for more than 30 minutes, the total sleep time is less than 6 hours. Second, the performance of social function impairment: daytime dizziness, fatigue, lack of energy, fatigue, drowsiness and inattention, etc., severe cases showed cognitive decline and affect work and study.