Last updated: 29 August 2014
If you’re unsure if you’ve ever experienced a hypnic jerk, then ask yourself this question:
Have you ever woken up with a sudden jolt just as you’ve started falling asleep? Or maybe it felt like you were falling?
It could be that it felt like you were having a huge muscle spasm. You may have even felt a small shock sensation or a bouncing feeling.
Perhaps it was even your partner that was experiencing it, and this in itself startled you back to consciousness.
It could be then (though not necessarily) that you experienced a hypnic jerk. And if so, you’re certainly not alone.
It’s estimated that around 70% of people experience hypnic jerks at some point in their lives. I know I definitely have.
The world of sleep can be confusing, and there’s no exception when it comes to the hypnic jerk. Confusing because it’s also sometimes called by one of the following names:
- Night starts.
- Sleep starts.
- Hypnagogic jerk – hypnagogic being a term used to describe the period of time when falling asleep.
- Myoclonus, or myoclonic jerk – technically this is the medical term to describe an involuntary muscle twitch.
So what is a hypnic jerk exactly?
A hypnic jerk is an involuntary twitching of a muscle, or muscles (the myoclonus as mentioned above). They usually occur just as you’re falling asleep. This is referred to scientifically as the hypnagogic state of consciousness.
This is why they are sometimes call hypnagogic jerks – because you most commonly experience them when falling asleep.
Note that hypnic is also a shortened version of the word ‘hypnagogic’. So you can see why there are all these possible expressions to describe the same thing.
When you experience a hypnic jerk it often causes you to wake up suddenly. When you wake up you may feel like you’re experiencing the sensation of falling or jolting.
Note that the muscle twitching you experience also occurs in other situations. For example hiccups are also muscle twitches.
That strange time of the night
It’s during this phase of falling asleep that several unusual phenomenon may take place. For example we discussed in a previous article the various sleep paralysis experiences people have. Those often come with bizarre or frightening hallucinations, or even out-of-body experiences.
Luckily there’s nothing to be worried about – hypnic jerks along with these other phenomenon are not dangerous. They may be unsettling or frightening, but you don’t need to fear going to sleep just because they may happen to you.
The first poll below was open for a year and has provided a fascinating insight into the frequency that people experience hypnic jerks. I have now closed it and opened two more to continue with the idea of this being an interactive and evolving article which takes readers’ views into account. So please take a moment to fill them in. Thanks!
Poll 1 (now closed)
How often do you experience a hypnic jerk?
- A couple of times a week (41%, 1,957 Votes)
- Every day (38%, 1,827 Votes)
- Rarely (21%, 1,016 Votes)
- Never (0%, 14 Votes)
Total Voters: 4,814
Poll 2 (open to votes)
Poll 3 (open to votes)
What causes the hypnic jerk?
So now you know that the hypnic jerk is a twitching of the muscles. But what causes the muscles to twitch in the first place?
As is often the case with the complex world of sleep, scientists are still not 100% certain about this. However, they do believe that the following factors can all contribute to hypnic jerks happening:
- Heavy exercise late in the evening
- Sleeping in an uncomfortable position
- Being very tired or fatigued
In addition to these factors which can contribute to the likelihood of a hypnic jerk occurring, there are 2 theories as to why they happen:
1. The first theory is that they happen as a normal part of the nervous system relaxing and slowing down. For example your breathing slows down, temperature drops and your muscles relax. They are then thought to occur because of the muscle relaxation.
2. The second theory is that while relaxing as you fall asleep, your brain sometimes gets confused and thinks you’re falling. So it sends signals to the arms and legs to move to an upright position, resulting in the jerking sensation.
I have read viewpoints that the brain gets so confused it thinks the body is dying or falling to its death, and so wakes you with a jolt. But I personally don’t have much faith in that more extreme conclusion!
Make sure it isn’t another sleep disorder
If you’re experiencing what you think are hypnic jerks, then for some people it could be something more serious like Sleep Apnea.
If you have breathing difficulties when sleeping, or wake up with a gasp or croak it may be wise to consult a medical professional to rule out Apnea.
A doctor would also be able to rule out the possibility of epilepsy. A small number of people with epilepsy only experience seizures during the sleeping hours.
It’s also possible that you may have restless leg syndrome, or periodic limb movement disorder. Again these would be diagnosed by a medical professional or sleep expert.
And most rarely of all, is the possibility of exploding head syndrome. This sleep disorder is also harmless, and is characterized by a very loud noise in your head. It could sound like a bang or any other loud noise, and will wake you up suddenly.
For the majority of people though, the hypnic jerk is a common and harmless phenomenon.
How can you stop hypnic jerks?
The hypnic jerk is such a common occurrence, that it may not be possible to prevent it happening completely. However, you can take steps to address some of the factors thought to increase the likelihood:
- You can cut down on alcohol and caffeine, especially in the 3-4 hours before going to bed.
- Try not to do heavy exercise late in the evening or night.
- Ensure you are getting sufficient magnesium and calcium in your diet – this can help with muscle and nerve spasms.
- Make sure you have a comfortable mattress and bedding, and that you sleep in a comfortable position, even with a partner. Personally I’ve found that I often experience a hypnic jerk when I am cuddling my partner to fall asleep, but am not really in the most comfortable position.
- If you are someone that suffers from anxiety or stress, then this is another issue to address altogether. However, you may find some useful advice in the section about relaxation exercises for sleep. This covers practical short-term exercises, and also some ideas for more long-term techniques to tackle stress and anxiety.
- Try not to allow yourself to get too tired or fatigued. Obviously this depends on your particular circumstances, as some people understandably have very busy and tiring lives. But it may be up to you to try to give more importance to how much sleep you get. Have a read of the section on attitude towards sleep for some ideas about this.
Avoid the vicious cycle of worrying that you will experience a hypnic jerk
Hypnic jerks can become cyclical if you start worrying about them. This is a very common thing that happens with sleeping difficulties.
For example people who have insomnia will often start worrying that they won’t be able to get to sleep. This worrying then becomes the thing that causes their insomnia, even if the original cause has long gone.
So in the same way, if you worry about hypnic jerks, then you may start to get less sleep and become more fatigued. Being fatigued is thought to contribute to the frequency of hypnic jerks, and so it’s more likely you’ll experience them.
You now know that a hypnic jerk is not dangerous, and that many people experience them. So hopefully you can start to relax about them, and not go to bed thinking about them.
Readers’ ideas, tips and techniques to cure hypnic jerks
If you look below you’ll see a vast number of comments from previous readers, many of whom have offered their own ideas on what can make hypnic jerks better or worse.
First of all, I’d like to acknowledge and thank everyone for such detailed comments and for sharing your thoughts.
Secondly, I’m going to start a list of ideas which people have provided. Please note that many of these have no evidence to back them up. It’s simply a list of some things which other people say can contribute to hypnic jerks or improve them.
- Don’t stress about it, as worrying about it makes it worse (easier said than done, but not impossible!).
- Try to deal with major stress in your life – many people say they’re worse when they feel stressed.
- If you’re someone who suffers from anxiety, then take steps to tackle this in general, as this may help reduce the hypnic jerks. It may also help you stop worrying about them.
- Drink Cayenne pepper tea (I suggest doing some research into this online first).
- Magnesium supplements have been helpful for some people, as has rubbing Magnesium oils or transdermal Magnesium into the area where you most commonly twitch. One suggestion was to get a blood test to check if you have a deficiency.
- Try to see the funny side! Not everyone will agree, but some people say they just laugh them off.
- Try acupuncture.
- Make sure you get enough Calcium in your normal diet, or take supplements.
- Stop working out for a while if you are doing strenuous exercise and see if it improves.
- Don’t drink alcohol, coffee or energy drinks for a while and see if it improves.
- Try to see them as a sign that you must be falling asleep, and that it’s a positive thing as you know you’ll soon be asleep.
- Talk to your doctor about any medication you’re on, including over-the-counter sleep aids to check if any could be increasing the frequency or strength of your hypnic jerks.
- In addition to the above, check that medication you’re taking doesn’t have a side-effect of myoclonus (which many do!)
- Sleep aids and allergy medication containing the anti-histamine Diphenhydramine can sometimes cause twitching. Try stopping them temporarily if you use them regularly.
- Try taking electrolyte pills or solutions which athletes use, and are also given for fluid loss.
- Try to sleep in a different position from your back – one suggestion was that the fetal position can help.
- Don’t go to bed late at night (this ties in with having good sleep habits in general).
- In terms of prescription medication, some people say Clonazepam has helped them (benzodiazepines are not a long-term solution though).
- Film yourself sleeping! One reader said he discovered through doing this that he was snoring, and that the hypnic jerks occurred while he was snoring heavily.
- Some female readers in particular feel that it can be connected to hormonal changes.
- Ask for a referral to a sleep clinic if you’re able to and it’s particularly troubling.
- Maintain a healthy, balanced diet. Eat less sugary and salty foods, and eat plenty of fruit and vegetables.
- Ensure you have a quiet sleeping environment, as it could be a sudden noise which startles you awake.
- Stay hydrated by drinking plenty of water during the day.
- If you’re being bothered by them repeatedly, get up and do something relaxing for 10-20 minutes, then try to sleep again.
- Have a light snack before bed. And if they’re occurring repeatedly, get up and have a light snack. A banana is a good option.
- Have a warm shower before bed, then do relaxation exercises before getting into bed, or even while in bed.
- If you do exercise, it could be excess lactic acid contributing to hypnic jerks. So try looking into ways to reduce the lactic acid.
Once again, a big thanks to everyone who took the time to contribute to this list of ideas to try. I know many future readers will appreciate having so many possible options to consider. And hopefully it will inspire them to continue adding more ideas in the future.
What do you think about hypnic jerks?
There isn’t much research published about the hypnic jerk, mainly because it is thought to be harmless. So I’m interested to know what your experience is. How often do you have them? What seems to make them worse or more frequent? What do you find helps to reduce them?
Please share your experiences in the comments box below and help out other readers with your ideas and theories. And if you just want a place to express what you’ve been going through, then you’re most welcome to do so here.