I experience suffocation anxiety about once every 4-5 weeks after waking in the early hours of the night and must immediately get out of bed and walk around. Sometimes this helps but more often than not it continues until hours later when I fall asleep from exhaustion. It seems to coincide with beginning of taking elderpryl about a year ago. I have cut back from 10 mg to 5mg but that hasn't helped. Never having experienced this before, it is scary. I also take three 50/200 Sinemet CR in halves spread through the day. Has anyone had similar experience? Bob 60/7