Falling asleep while not tired.?

May be a deficiency. Of some nutrient or a symptom of something more serious, get a good physical exam and screening labs.

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Falling asleep while driving, not tired.?

Dangerous. Falling asleep while driving is dangerous. It increases risk of auto accidents. It is a symptoms of excessive sleepiness. The commonest causes are not getting enough time in bed, sleep apnea, depression, other sleep disorders including narcolepsy. See your doctor or a sleep medicine specialist. Read more...