I must say that reading these postings has both frightened me and reassured me that I am not losing my mind! Levaquin has been only mildly helpful for my UTI, but the side effects have been most unpleasant: nausea, constipation, gas, and insomnia. I unfortunately took my first dose in the early evening since I had just picked up the prescription that afternoon, and kept taking it at that time of day. It took me a few days to realize that I wasn't just having a sporadic bad night, but that the medication was making me very restless and unable to sleep. I have been taking Ambien to help me soldier through, but the postings on this site have led me to believe that I'd be better off taking the medication. Thanks to all of you for sharing so that folks like me better understand what they're going through!