cough and nasal congestion
"Bad case of Bronchitis and sinus pressure. I took Mucinex DM, 1 pill every 12 hours, for a week. I would fall asleep fine, but wake up 3-4 hours later and could not get back to sleep. I ran out of DM, and for the last few days took the Mucinex D instead. Not much sleep the first night, NO sleep at all last night combined with a lot of post nasal drip and the jitters. So glad I finally figured it out, as I'm a walking zombie right now. I will never take Mucinex D past the morning hours again."