I was given samples of Levaquin 750 mg by an urgent care physician for a UTI. Fortunately, he only gave me 3 pills because I did not sleep a wink for 72 hours. My heart raced and I was concerned that I could not rest. The first day that I did not take a pill I was able to return to my normal sleep habits, thankfully. I should also note, although I did not sleep, I operated with an excessive amount of energy and no other side effects.