Ativan is considered an anti-anxiety med. I've given to patients who were so worked up they were literaly climbin' the freakin' walls. Well, after a couple of minutes, they just calmed right down to the point that they fell asleep. I mean a deep sleep that lasted for about 6-7 hours. Now mind you, this was a dose of .5 mg given IV push. My experience with administering ativan suggests to me that taking it when you don't need it is a waste. If I want to fall asleep, I'll just take a tylenol PM, or have a couple of beers. One other thing, the suggested dose for ativan is .25mg-1mg every 4-6 hours by mouth as needed. I'm hoping that 64mg was done over a loooong period of time. One of the main side effects of ativan is respiratory depression. It is also habit forming, and I believe that you can become somewhat tolerant to it also. Please be very careful!!