失眠以睡眠时间不足,睡眠深度不够及不能消除疲劳、恢复体力与精力为主要症候特征。其中睡眠时间不足者可表现为入睡困难,夜寐易醒,醒后难以入睡,严重者甚至彻夜不寐。失眠是临床常见病之一,虽不属于危重疾病,但常妨碍人们的正常生活、工作、学习和健康,并加重或诱发心悸、胸痹 Insomnia lack of sleep time, sleep depth is not enough and can not eliminate fatigue, restore physical strength and energy as the main symptoms. Insufficient sleep time can be manifested as difficulty falling asleep, night sleep easy wake up, wake up hard to sleep, serious or even sleepless nights. Insomnia is one of the common clinical diseases, although not a critical illness, but often prevent people’s normal life, work, study and health, and aggravate or induce heart palpitations, chest pain