Has anyone ever taken benzonatate and has problem with sleeping?

I have a bit of a sinus condition that causes nasal drip and makes me cough at night. My doctor prescribed benzonatate and I took it about 10 pm last night. I could not sleep at all last night and the last time I slept was 27 hours ago. My eyes are dry and so are my sinuses. True enough, the coughing is no more, so its not keeping me awake. But the drug has my mind wide awake. I’ve tried reading and other things that will normally knock me out but I can’t sleep.
I’m hoping someone in fluther has taken this drug before and can give me a ball park idea of how long before I am able to sleep.