Nocturnal emission

A nocturnal emission — usually called a wet dream — is when ejaculation happens during sleep. You wake up and your underwear or sheets are damp with semen. It's completely involuntary (you have no control over it), completely normal, and especially common during puberty. It's just your body doing its thing.

• A nocturnal emission is ejaculation during sleep. Most people call it a wet dream.
• It's very common during puberty, when the body is producing semen for the first time.
• You can't prevent or control it. It happens while you're asleep.
• It might happen alongside a sexual dream, or it might not — sometimes there's no dream at all.
• It's not a sign of anything being wrong. It usually becomes less frequent as you get older.

Why it happens

During puberty, the body starts producing sperm and semen. Wet dreams are part of this process — they're the body's way of releasing semen that's built up. They tend to happen during REM sleep (the deep sleep phase where most dreaming occurs), and they're linked to the natural erections that happen several times during a normal night's sleep.

Some people have wet dreams that come with a sexual dream. Others wake up having ejaculated with no memory of dreaming at all. Both are normal. The dream doesn't cause the ejaculation — it's a physical process that sometimes overlaps with dreaming.

How common they are

Very. Most people with a penis experience wet dreams at some point during puberty. Some have them frequently (several times a week for a while), others rarely. Some never have them at all — that's also normal.

They tend to become less frequent as you get older, partly because the body adjusts to its new hormone levels and partly because many people start masturbating or become sexually active, which provides other ways for the body to release semen. But some adults still have occasional wet dreams, and that's fine too.

The practical bit

Waking up to damp underwear or sheets can feel embarrassing, especially if you share a room. A few things that help:

• Keep spare underwear or pyjama bottoms by your bed
• Dark-coloured sheets show stains less
• A quick rinse with cold water gets semen out of fabric better than hot water (hot water can set the proteins)
• Nobody needs to know. It's private and it's normal.

Things people get wrong

"Wet dreams only happen if you don't masturbate." They're more common if you're not ejaculating regularly through masturbation or sex, but they can still happen regardless. They're not a sign that you "need" to masturbate more.

"Wet dreams mean you're thinking about sex too much." They're a physical process, not a reflection of your thoughts. You can't think your way into or out of them.

"Only boys have wet dreams." People with a vulva can also experience arousal and orgasm during sleep, though it's less talked about. It doesn't usually involve visible fluid in the same way, so it gets less attention, but sleep-related arousal and orgasm happen across all bodies.

Things people ask about nocturnal emissions

Can I stop them from happening?

No, and you don't need to. They're involuntary — your body does it while you're asleep. They're a normal part of development and they reduce on their own over time.

Is it normal to have them a lot?

Yes. During puberty especially, some people have them multiple times a week. The frequency varies and usually decreases as your body adjusts.

What if someone notices?

It's a private bodily function, like anything else. If a parent notices when doing laundry, most will understand — they went through puberty too. If you want to manage it discreetly, rinsing your own underwear is straightforward.

Does having a wet dream mean I'm ready for sex?

No. A wet dream is an involuntary physical process. It doesn't say anything about your emotional readiness or whether you should be having sex.

A nocturnal emission is the medical word for a wet dream. It's when a boy or man releases the white fluid from the penis (called semen) while they're asleep. You wake up and your underwear or sheets are damp.

It happens because during puberty, the body starts making semen for the first time. Wet dreams are just the body's way of releasing some of it. You have no control over it — it happens while you're completely asleep.

Sometimes it happens during a sexual dream. Sometimes there's no dream at all. Both are normal.

Wet dreams are very common during puberty. Some people have them a lot, others rarely, and some never do. All of that is normal. They usually happen less often as you get older.

It can feel embarrassing, especially if you share a room. Keeping spare underwear by your bed helps. Rinsing fabric with cold water (not hot) gets the stain out easily.

Wet dreams don't mean anything is wrong. They don't mean you're thinking about sex too much. They're just a normal body thing that happens during puberty.