Correct answer
No, alcohol may still be present on waking.
No. Alcohol is eliminated slowly, mainly through liver metabolism, and may remain on waking after heavy drinking. The DGT warns that a few hours of sleep do not guarantee safe driving. Absorption into the blood and elimination from the body are different processes. Do not use sleep, coffee or a shower to decide that you can drive: do not drive after drinking.
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Yes, merely feeling alert on waking is enough.
Yes, sleeping immediately eliminates all ingested alcohol.
No, alcohol may still be present on waking.
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