Alprazolam is taken about 1 to 2 hours to sleep. Alprazolam belongs to the benzodiazepine class of drugs, this class of drugs orally absorbed from the gastrointestinal tract within 1 to 2 hours, alprazolam half-life in the long, generally inactive metabolites, the drug is small after-effects, within a few days can reach steady state. It is used primarily for anxiety, nervousness, and agitation, but also as an adjunct to hypnosis or anxiety, and to relieve acute alcohol withdrawal symptoms. Studies indicate that moderate doses of benzodiazepines (BDZ) have a significant sedative-hypnotic effect and can be tolerated with continuous use. Most studies have shown that BDZ increases sleep duration, decreases sleep latency, decreases alertness and reduces stages 1, 2, 3 and 4 sleep. Shortening of stage 4 sleep may result in fewer nightmares and longer net sleep duration. Adverse effects: drowsiness, dizziness, and fatigue are common; ataxia, tremor, urinary retention, and jaundice are occasionally seen in high doses. There are addictive properties, and withdrawal reactions can occur after discontinuation of the drug after prolonged application. Alprazolam has addictive and other adverse reactions and contraindications, need to be under the strict guidance of the doctor, strictly follow the medical advice for use, to avoid blind use of drugs and aggravation of the condition, the process of taking medication if there is discomfort, it is recommended to go to the hospital in time.