7 weird things that can happen while you sleep
Some of these might be happening to you without you knowing.

1. Feeling like you’re falling

Also known as a hypnagogic jerk, it tends to happen as you’re falling asleep.

Typically when you dream, your body is paralyzed, but sometimes you can start dreaming before your body is on “off” mode.

With hypnagogic jerks, you might act out a dream like falling off a cliff, falling from the sky, or tripping, says Dr W Christopher Winter, Men’s Health sleep advisor and medical director of the sleep centre at Martha Jefferson Hospital in Virginia.

Why the falling? Researchers aren’t sure. “It’s more likely to happen when you’re overtired, sleep-deprived or stressed,” Dr Winter says. “And your brain enters into sleep cycles more aggressively, but your body hasn’t caught up.”

2. Sleep paralysis

You start to wake up in the morning and realize you can’t move a muscle or speak. It can last from several seconds to several minutes, and it’s completely terrifying.

Essentially, it’s the opposite of what happens with hypnagogic jerks, where your brain wakes up before the paralysis that accompanies deep sleep goes away, Dr Winter says.

“You may feel like you can’t breathe. Many people describe it as an elephant sitting on their chest. That’s because all of the muscles that control your breathing except for the diaphragm are still paralyzed.”
3. Sleepwalking
Most sleep-related behaviors are harmless. But sleepwalking can be a dangerous issue, since you can trip, walk into something, leave your house or even get behind the wheel.
“With sleepwalking, you’re coming out of sleep just enough for your body to move, but not enough for your brain to be awake,” says Dr Winter.
That’s why you probably have no recollection of your late-night jaunts. The prescription sleep-aid Ambien (known as Zolpidem in South Africa) has been linked to some of the more bizarre sleepwalking incidents including cooking, binge eating and driving while zonked out.
That’s because even if you wake up during the night, the drug keeps your brain sedated so you’re still in an unconscious state, Dr Winter says.
If you experience unusual or dangerous nighttime antics and pop the sleeping pill, talk to your doctor about switching prescriptions.
4. Sleep-talking
About 5% of adults yap in their sleep, according to the American Academy of Sleep Medicine. Most pillow-talk sessions last only about 30 seconds on average.
“It often happens within the first hour or two of sleep when your body is entering into deep stages of sleep, but there’s still enough muscle tone to produce sounds or movements that may accompany dreams,” says Dr Winter.
5. Recurring dreams
“Dreaming is a way for your brain to sort out things it needs to reevaluate and process before it can file them away as memories,” Dr Winter says. “Recurring dreams may happen with unresolved psychological issues your brain is trying to sort out.”
Oftentimes, recurring dreams are based partly in reality. “If you were robbed at the grocery store, you might replay that over and over during sleep until you come to grips with it – whereas if you went to the store to get bread and milk, your brain would process it right away and move on,” Dr Winter adds.
6. Sleep sex
You’re not the only one who has woken up mid-act. In a study of more than 800 patients at a sleep disorders centre, about 8% of patients reported incidents of sexsomnia – initiating sex with a partner while asleep, according to researchers at the University Health Network in Toronto.
“In my experience working with patients, the attitudes, behaviours and things people may say during sleep sex are often very different from what they’d do and say when fully awake,” Dr Winter says.
As a parasomnia, the phenomenon is similar to sleepwalking – you’re coming partly out of deep sleep enough that you can move and possibly talk, but your brain isn’t awake enough to be fully conscious.
“Many people have a vague recollection of it happening during the night or they wake up during sex,” says Dr Winter. “It’s possible you may have been dreaming about sex or perhaps you went to bed with the urge.”
 
7. Exploding Head Syndrome
It’s just as freaky as it sounds: “All of a sudden, the person wakes up having heard a really loud noise, like an explosion, a flash of light, or a sense that their head is exploding,” says Dr Winter. “In reality, nothing has actually happened.”
It’s a type of hypnagogic jerk, similar to feeling like you’re falling: You’re heading toward deep sleep, but your body hasn’t achieved paralysis yet, and your senses are still turned on.

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