Sleep apnea is a disorder characterized by __________

A) difficulty falling or remaining asleep.
B) nodding off without warning in the middle of the day.
C) difficulty breathing while asleep.
D) experiencing temporary paralysis immediately after waking up from sleep.

Sleep apnea is a disorder in which a person experiences pauses in breathing or shallow breaths while sleeping. This can lead to a decrease in oxygen levels and can result in snoring, gasping, or waking up feeling tired. Difficulty falling or remaining asleep (A) and nodding off without warning in the middle of the day (B) are symptoms of other sleep disorders. Experiencing temporary paralysis after waking up from sleep (D) is a symptom of a condition called sleep paralysis.