I'd forgotten to put my mask on! I'd changed the sheets that morning and hung the mask over the top rail of the bed. Since my bedroom was dark, I did not see the mask hanging above my head until I was exiting the bathroom. Took down the mask, got in bed and was asleep within 5 minutes.
Morale of the story: Having slept every night since titration (in 1995) with a CPAP, I can no longer get to sleep without it!
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