Hi. I'm new here and this is my first question. Is it common for oxygen levels to drop while laying down? Was diagnosed with COPD about a year ago and was prescribed Anoro. Things have been pretty good until this week when my oxygen drops while sleeping and I wake up gasping for breath and a tingling feeling in my head. As soon as I concentrate on breathing my oxygen level will rise. Not getting much sleep these days so I'm exhausted. Is this a problem for anyone else?