Sleeping pills to take a capsule of how long the effect is mainly based on the half-life of sleeping pills and each person’s physique is different and different, according to the different half-life of sleeping pills, its effect time can be divided into about two hours, eight hours and twenty-four hours. 1、At present, most of the new sleeping pills commonly used in clinical practice are short-acting sleeping pills. These sleeping pills have a fast onset of action and a short duration, and are generally used for patients who have difficulty falling asleep. The duration of efficacy is maintained for two hours, but the quality of sleep can be ensured if there is no obstacle to sleep maintenance after the expiration of the drug. 2, medium-acting sleeping pills. Common intermediate-acting sleeping pills are Xuloan Ding, this kind of sleeping pills generally about eight hours for a half-life, that is, this kind of sleeping pills can maintain sleep for about eight hours. 3. Long-acting sleeping pills. Such as nitro valium or clonidine, generally the effective half-life of such drugs for about twenty-four hours. It is recommended that the patient according to their own situation, under the guidance of the physician to choose the appropriate drugs, follow the doctor’s instructions for medication.