The reasons for not being able to sleep after quitting smoking are as follows: first, it is a normal physiological situation, because people smoke for a long time, it will produce a certain stimulating effect on the nerves of the brain, this stimulating effect is long-term, and the formation of a conditioned reflex. So when people quit smoking within a period of time, due to the lack of brain stimulation, it will cause the brain to produce excitement or anxiety, etc., will cause the normal physiological function of brain nerves or brain cells disorder, there will be sleeplessness. Second, the psychological factors caused by the spirit, because a long time smoking, from the psychological or spiritual dependence, this dependence on the formation of conditioned reflexes. Therefore, if you suddenly quit smoking, in a period of time to quit smoking, psychologically and mentally failed to adapt to this change, will also appear sleepless.