I have been taking Alprazolam 0.5 mg for about 4 months now. I had no problem going to sleep but had difficulty staying asleep. My sleep would be fragmented and I'd wake up multiple times throughout the night. I also couldn't get deep sleep. It was like I was half awake and half asleep. This sleep deprivation led to anxiety issues which caused polyarthralgia. I can only stay asleep when I take this drug about an hour before going to sleep every night. As others mentioned, I'm also concerned about being dependent on this drug for rest of my life. Another concern is that I might develop tolerance to this drug which means it won't work anymore as I read it somewhere online. I hope it keeps working for me.