There’s no shortage of slang terms for the biological response known as “nocturnal penile tumescence.” There’s everything from morning wood to pitching a tent to getting a visit from the boner fairy and more. But what causes men to wake up with an erect member? Is it only a sexy dream that causes this undercover stirring or is there something more to it? This extremely common morning present is actually a good sign. Read on to learn more about why men get erections during sleep.

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