I am currently on Vistaril. This is the first time for me. The first few doses made me overwhelmingly sleepy. I have not noticed a major difference in my level of anxiety, but I am sleeping now. I used to have disturbances in my sleep. When I sleep now, if I wake up, it's not long before I go back to sleep. It's an effective drug, but everyone's chemical makeup is different. What works for one, will not work for all.