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The total sleep time and sleep stage distribution of room air control, isocapnia, and hypercapnia treatment conditions. There was no difference in terms of total sleep time and sleep stage distribution among room air, isocapnic rebreathing, and hypercapnic rebreathing. S1 and S2, Stage I and Stage II non-rapid eye movement sleep; S3, Stage III sleep; REM, rapid eye movement sleep.
