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People with COPD who need and use continuous oxygen therapy 24 hours a day tend to have a longer lifespan than those who use it only while awake (15 hours per day). In turn, individuals who use oxygen therapy 15 hours per day do better than those who use it only while they are sleeping. Publication Review By: Peter B. Terry, M.D., M.A. Published: 08 Aug 2011
Many patients only need oxygen when they sleep and their oxygen levels are fine without supplemental oxygen during the day. But if you need oxygen both at night and during the day, using it only at night, while better than not using oxygen at all, is not sufficient to keep you well oxygenated during the day.