asthma
"My doctor was aware of my history of and treatment for anxiety and panic attacks when she prescribed this for me.  She directed that it be taken in the evening before bed and I don't know why that is.  There have been 2 or 3 times when I forgot to take it, so I took it the next morning.  I found that on the following nights, I had very strange dreams, woke to a panic attack, and had difficulty going back to sleep.  Since I have put that together, I have made sure to take the medicine at night and I haven't had any more problems."