Sleep Paralysis

If you have sleep paralysis you are awake but you are unable to move your body (paralysis) and unable to speak when you wake up from sleep. Sometimes it can occur as you are falling asleep. Sleep paralysis is common but many people only experience sleep paralysis once or twice in their life. The most important treatment is to have a regular sleep routine and to make sure you always have enough sleep. Medicines may help if you have frequent or severe episodes. The episodes of sleep paralysis tend to become less as you get older and don't cause any long-term problems.

During normal sleep there are different types or phases of sleep that you go through. Within the first hour of going to sleep you usually go into a phase of slow-wave sleep (SWS); this happens as your brain's activity levels drop. After a while, these activity levels then start to increase again. This is accompanied by rapid eye movements and deep relaxation of your muscles. This phase of sleep is known as rapid eye movement (REM) sleep. It is during REM sleep that you tend to dream. A phase of REM sleep can then be followed by SWS again.

Throughout the night, you cycle between SWS and REM sleep. But, as the night continues, phases of SWS become less frequent and you have increasing phases of REM sleep. There is a complex system within the brain that controls your sleep-wake cycle. It involves brain chemicals called neurotransmitters.

If you have sleep paralysis you are awake but you are unable to move your body (paralysis) and unable to speak when you wake up from sleep. 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.

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.

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 also the separate leaflet called Narcolepsy and Cataplexy.

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.

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.

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 usually disappear. However, sometimes the sleep paralysis seems to have resolved but further episodes may then start again.

Now read about Narcolepsy and Cataplexy

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  • Sharpless BA, Barber JP; Lifetime prevalence rates of sleep paralysis: a systematic review. Sleep Med Rev. 2011 Oct 15(5):311-5. doi: 10.1016/j.smrv.2011.01.007. Epub 2011 May 14.
  • Howell MJ; Parasomnias: an updated review. Neurotherapeutics. 2012 Oct 9(4):753-75. doi: 10.1007/s13311-012-0143-8.
Dr Colin Tidy
Peer Reviewer:
Dr Hayley Willacy
Document ID:
29154 (v1)
Last Checked:
12 November 2015
Next Review:
11 November 2018

Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions. Patient Platform Limited has used all reasonable care in compiling the information but make no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. For details see our conditions.