Two,physiological factor:All sorts of nervous mind,starvation,toilsome,sexual drive and other diseases such as arthritis,ulcer disease,angina,migraine,asthma and arrhythmia may cause insomnia.

• (2)生理因素：精神紧张、饥饿、疲劳、性兴奋以及一些疾病，如关节炎、溃疡病、心绞痛、偏头痛、哮喘、心律失常等都可引起失眠。