Xanax (alprazolam) will cause sedation, drowsiness and somnolence for a side effect but isn't usually prescribed to help with sleeplessness (difficulties sleeping) routinely. Sleepiness right after taking Xanax commonly occurs in 15 to 45 minutes. Go on looking at Drowsiness and Dizziness: These are definitely the commonest side effects https://medeusresearchchem.com/product/buy-alprazolam-powder-online/