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Nocturnal Erections and Penile Health

Nocturnal Erections and Penile Health

Nocturnal erections

Nocturnal penile tumescence (NPT) is a spontaneous erection of the penis during sleep or when waking up. Several less formal and well-known expressions might be morning hard on, morning wood or descriptions like morning glory all used to describe this natural anatomical process.  Have you ever wondered what causes the phenomenon?

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