Sedatives have the function of inhibiting the functional activity of the cerebral cortex, sedation hypnotic effect, played sedatives, may affect the level of consciousness, resulting in the patient into a state of sleep, but this situation is not absolute. 1, whether the use of sedatives will affect the patient’s consciousness, and many circumstances have a relationship, such as the patient’s weight is relatively large, or liver and kidney function is relatively good, the individual’s basic physical fitness, the regular dose of drugs, it will not affect the level of consciousness, the patient may also be normal communication with others. 2, if the physical quality is poor, through the intravenous administration of a larger dose of drugs, the speed of administration is relatively fast, the patient’s weight is also relatively light, after the injection of sedatives, will quickly enter the state of sleep, such as the use of diazepam, the patient’s sleep time can reach several hours to more than ten hours.