Hello Dr Samuel N. Grief. I hope you not in a state of continuous grief. (small pun). I do have a quick answer, and I work in mostly in biologics with APis improving patients with MS. So back to my question, I am very motivated, a real go getter, i exercise and and I m very active. problem is I cant stay asleep and I am up every 1 to 3 hours, with my mind racing. I take 1/2 tablet Ambien CR every other day with a glass of wine, that usually does the tick, but lately I am feeling some sort of respiratory distress usually at night when I lie down. Im thinking it allergies but feel this drug: ms be taking its toll on my heart. Cant find any literature and Seeing a pulmonologist is a few weeks out? Should i be concerned?