Sometimes it can occur as you are falling asleep. If someone touches you or speaks to you, the paralysis is relieved and you are able to move again.
The paralysis may last for any time from a few seconds up to a minute or two. It does not affect your breathing and does not cause you any harm. After the episode of sleep paralysis you can move and speak normally. However, you are fully awake and so sleep paralysis can be very frightening.
How common is sleep paralysis?
Sleep paralysis is relatively common. About 1 in 5 people have at least one episode of sleep paralysis during their lifetime. Sleep paralysis can affect people of all ages but it's more common in teenagers and young adults. Sleep paralysis is also more common in people of African descent and people who have mental health problems.
Many people only experience sleep paralysis once or twice in their lives. Other people may experience regular episodes of sleep paralysis.
Sleep paralysis may be caused by sleep deprivation, irregular sleeping patterns or jet lag. You may also be more likely to have sleep paralysis if someone else in your family also has it.
What causes sleep paralysis?
Your muscles normally become very relaxed and paralysed at certain times when you're asleep. Sleep paralysis occurs when the same mechanism to stop your muscles occurs when you've woken up or when you're falling asleep. Sleep paralysis occurs when some aspects of REM sleep happen when you are awake. This means that you remain temporarily paralysed but are fully conscious.
Sleep paralysis can sometimes be a symptom of narcolepsy. Narcolepsy is a long-term (chronic) problem that affects your sleep. You feel excessively tired during the daytime but have disturbed night-time sleep. You can also have sleep attacks where you fall asleep during the day without any warning. See separate leaflet called Narcolepsy and Cataplexy.
What are the symptoms of sleep paralysis?
The main symptom of sleep paralysis is being unable to move or talk for a brief period. The paralysis usually occurs as you're waking up but can also sometimes happen when you're falling asleep.
You will be fully conscious during the period of sleep paralysis. An episode of sleep paralysis can therefore be very frightening. Breathing is not usually affected but it may be difficult to take a deep breath. After the sleep paralysis you can move and speak normally but you will often feel upset and anxious.
During an episode of sleep paralysis, you may also experience unusual experiences (hallucinations). If you have hallucinations, you see, hear, smell or feel something that isn't really there, such as thinking there is someone else in the room.
Is there any treatment for sleep paralysis?
The most important way to treat sleep paralysis is to make sure you:
- Have enough sleep.
- Have regular sleep patterns.
- Are relaxed and comfortable when going to bed.
Medicines can be prescribed by your doctor if you have frequent or severe episodes of sleep paralysis.
General sleep advice
It is very important to get into a good sleep routine and to make sure you have enough sleep. General advice to help improve your sleep pattern includes the following:
- Get enough sleep - most adults need between six and eight hours of sleep each night.
- Go to bed and get up at about the same times each day to create a good sleep routine.
- Make sure your bedroom is relaxing, quiet and dark, and not too warm or too cold.
- Making sure your bed is comfortable.
- Have regular exercise during the day but not in the few hours before you go to bed.
- Both caffeine and smoking can have a bad effect on sleep patterns. Therefore, cut down on caffeine (for example, coffee) and, if you are a smoker, stop smoking.
- Only drink alcohol in moderation if at all. Don't drink any alcohol before going to bed.
- Don't eat any food just before going to bed.
Treatments using medicines
Your GP may refer you to a sleep clinic if your symptoms are severe or you have any other problems with sleep.
If your sleep paralysis is frequent or severe, you may also be prescribed a medicine that is also used to treat depression. The medicine used to help sleep paralysis is usually a short course of a tricyclic antidepressant. Tricyclic antidepressant medicines that are often used to treat sleep paralysis include imipramine and clomipramine. The medicine will help to prevent episodes of sleep paralysis and will also help to prevent any hallucinations that may occur with sleep paralysis.
What is the outcome?
Sleep paralysis does not cause any long-term problems. Many people only experience sleep paralysis once or twice in their lifetime.
Episodes of sleep paralysis tend to become less frequent as you get older and they usually disappear. However, sometimes the sleep paralysis seems to have resolved but further episodes may then start again.
Further reading and references
Insomnia - zaleplon, zolpidem and zopiclone for the management of insomnia; NICE Technology Appraisal Guidance, April 2004
Consensus statement on evidence-based treatment of insomnia, parasomnias and circadian rhythm disorders; British Association for Psychopharmacology (2010)
Buysse DJ, Germain A, Moul DE, et al; Efficacy of brief behavioral treatment for chronic insomnia in older adults. Arch Intern Med. 2011 May 23171(10):887-95. Epub 2011 Jan 24.
Taibi DM, Landis CA, Petry H, et al; A systematic review of valerian as a sleep aid: safe but not effective. Sleep Med Rev. 2007 Jun11(3):209-30.
Sleep diary; American Academy of Sleep Medicine
Buysse DJ; Insomnia. JAMA. 2013 Feb 20309(7):706-16. doi: 10.1001/jama.2013.193.
Insomnia; NICE CKS, April 2015 (UK access only)
Luik AI, Kyle SD, Espie CA; Digital Cognitive Behavioral Therapy (dCBT) for Insomnia: a State-of-the-Science Review. Curr Sleep Med Rep. 20173(2):48-56. doi: 10.1007/s40675-017-0065-4. Epub 2017 May 8.
Lemoine P, Zisapel N; Prolonged-release formulation of melatonin (Circadin) for the treatment of insomnia. Expert Opin Pharmacother. 2012 Apr13(6):895-905. doi: 10.1517/14656566.2012.667076. Epub 2012 Mar 19.
Qaseem A, Kansagara D, Forciea MA, et al; Management of Chronic Insomnia Disorder in Adults: A Clinical Practice Guideline From the American College of Physicians. Ann Intern Med. 2016 Jul 19165(2):125-33. doi: 10.7326/M15-2175. Epub 2016 May 3.
Sateia MJ, Buysse DJ, Krystal AD, et al; Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults: An American Academy of Sleep Medicine Clinical Practice Guideline. J Clin Sleep Med. 2017 Feb 1513(2):307-349. doi: 10.5664/jcsm.6470.
Hale L, Guan S; Screen time and sleep among school-aged children and adolescents: a systematic literature review. Sleep Med Rev. 2015 Jun21:50-8. doi: 10.1016/j.smrv.2014.07.007. Epub 2014 Aug 12.
Chang AM, Aeschbach D, Duffy JF, et al; Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proc Natl Acad Sci U S A. 2015 Jan 27112(4):1232-7. doi: 10.1073/pnas.1418490112. Epub 2014 Dec 22.
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