Cause sleeplessness symptoms and conditions

I was given 750 mg of Levaquin for sinus/ear infections, along with a prescription cough syrup. The first night, I had difficulty sleeping, along with racing heartbeat. I thought it was from the codene in the cough syrup, so I left it off the second night, but continued with the Levaquin. I THOUGHT I WAS GOING CRAZY! I had racing thoughts, pounding heart, leg cramps, terrible acid reflux and nausea, but worse than that, was CONSTANT thoughts of someone close to me dying. It was the next morning that I read in the 'packaging information' that the side effects 'could cause' sleeplessness, leg pain, anxiety, depression, nausea, etc. I won't take it again.
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I started taking Guaifen 3 days ago and i had a hard time sleeping. The first day i felt that my heart was beating very fast and i could not sleep at all. The next night, again, i was not able to sleep even 30 mintues altogether, and during those 30 mintues, i had nightmares. I did not know that this medication can cause sleeplessness until i read the side affects. I knew there was something wrong becuase it is unlike me not to sleep, since i love sleeping.

I've been on several medications for my heart including Toprol. I've begun checking side effects on all to see which one may cause sleeplessness. I've been experience shortened sleep patterns, awakening in the early hours around 2:30am and unable to go back to sleep. I attributed this to external factors until recently when I missed all my medications for several days in a row and noticed I slept the nights through. I do have most of the other side effects mentioned, fatigue, lightheadedness, mood swings and memory problems. I also take Niaspan and Zetia.

Does Pravachol cause sleeplessness? Sure been having trouble getting back to sleep when I wake up at 1 AM and stay awake the rest of the time. M