Viagra keeps you up at night

No, not (just) that part - your brain. A new study shows that a single dose of Viagra makes symptoms of sleep apnea worse. And sleep deprivation resulting from sleep apnea may be one of the reasons why you may need Viagra in the first place. What a vicious circle! What a conundrum! Sleepdoctor has the goods.

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I had to think about this for a bit before it made sense (free registration on Medscape required):