Correct answer
Yes, it can impair driving well before falling asleep.
Yes. It can affect attention and reaction ability well before falling asleep and can occur by day or night. Frequent yawning, difficulty keeping eyes open or losing concentration are warning signs. Stop somewhere safe and rest; do not wait until you are about to fall asleep or substitute an open window for rest.
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No, it only affects driving at night.
Yes, it can impair driving well before falling asleep.
No, impairment starts only at the instant of falling asleep.
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