Depends on situation: The longer the procedure takes, the longer a patient will be sleepy afterwards. Elderly people take longer for medications to clear out of their systems. If your father needs pain medications after surgery, he will also feel sleepy from those. This is why it is impossible to predict exactly how long it will take to wake up. But modern anesthesia medications usually wear off fairly soon.
Answered 7/22/2012
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2 doctors weighed in across 2 answers
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A doctor has provided 1 answer
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