Home › CDL Practice Tests › General Knowledge Questions › Question 263
How does untreated sleep apnea affect a commercial driver?
- A.It only causes snoring with no driving effect
- B.It improves oxygen levels at night
- C.It matters only for passenger drivers
- D.It fragments sleep, causing daytime sleepiness and slower reactions even after a full night in bed
Correct answer
D. It fragments sleep, causing daytime sleepiness and slower reactions even after a full night in bed
Why
Sleep apnea repeatedly interrupts breathing and sleep quality, so the driver wakes unrefreshed and is prone to drowsy episodes. Diagnosis and treatment protect both the driver's health and the medical certification needed to drive.
Manual topic: Fatigue - Sleep Disorders · From the General Knowledge practice bank (GK-263).