Oh, you haven't? Well, you will now never be able to unthink that thought. You're welcome.
Your bed used to be the safest, cosiest place on the planet. Think again. Here are six terrifying things that can actually happen to you while you are asleep (not including Freddie Kruger).
This is what it sounds like, an inability to move or speak while you are falling asleep or waking up. Luckily, according to the NHS, this is only temporary.
an inability to move
a feeling of pressure or even crushing on your chest
hallucinations that a person is in the room with you
Sleep paralysis happens when aspects of REM (rapid eye movement) sleep occur while you are awake.
According to the NHS, REM sleep is when your brain is extremely active, and when dreams occur. Your body is temporarily paralysed by the brain during this period, possibly to stop you from acting out your dreams.
Ways to prevent it include ensuring you get a good night's sleep, as sleep deprivation has been found to be linked to episodes of sleep paralysis. Other things to consider are a family history of sleep paralysis, and sleeping on your back, which have also been associated with the condition.
Sleep apnea (obstructive)
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Obstructive sleep apnea (OSA) occurs when the throat passage narrows during sleep, temporarily cutting off breathing.
Stopping breathing will not suffocate you, as sufferers from OSA regularly wake up. They may also be snoring, much to the chagrin of their partners.
Nevertheless, the idea that your throat can close up while you're asleep is horrifying.
OSA is more common in men and overweight people, as well as in smokers, heavy drinkers, and some menopausal women.
Ways to treat it include using a device to keep the airflow open, and lifestyle changes such as exercise, sleeping on your side, and cutting down on alcohol.
This occurs during a period of deep sleep, a state which is often reached just a few hours into sleep.
While not harmful, it's quite bizarre that your brain can even do this.
The study attempted to rouse people from sleep using certain smells, including that of smoke from a fire. Worryingly it found that other senses would be needed to alert your sleeping self that there was a fire in your vicinity.