12. Sleep Disturbances
Why it happens: Low oxygen levels during sleep trigger frequent awakenings and restless nights. Sleep apnea is common in lung failure.
How it feels: Patients wake up gasping, snore loudly, or feel unrefreshed despite long sleep.
Medical Tests:
- Polysomnography (Sleep Study): Detects apnea and oxygen drops.
- Overnight Oximetry: Simple screening test at home.