Sleep paralysis
You wake up and understand everything, but cannot move or say a word — and sometimes it feels as if someone is in the room. This is sleep paralysis: frightening, but usually harmless.
What is happening
During REM sleep the body's muscles are relaxed so that we do not act out our dreams. In sleep paralysis the mind wakes up before the body: you are awake, but the muscles are still 'asleep'. It lasts from a few seconds to a couple of minutes and passes on its own.
What it feels like
Being unable to move or speak, pressure on the chest, a sense of someone's presence, sometimes vivid images and sounds on the border between sleep and waking. Many cultures have folk stories about a creature sitting on the sleeper's chest — that is how people explained the strange sensation.
Why it happens
Most often with lack of sleep and an irregular schedule, shift work, stress and anxiety, and sleeping on your back. Researchers estimate that a noticeable share of people experience sleep paralysis at least once in their lives, especially when young.
What to do during an episode
Do not fight with all your strength — that intensifies the fear. Remind yourself that this is sleep paralysis and it will pass. Focus on your breathing and try to move a finger or toe, blink or move your eyes — this usually helps you come out of it.
When to see a doctor
If episodes happen often, disturb your sleep, make you afraid to fall asleep or come with strong daytime sleepiness, see a sleep specialist or neurologist.
Frequently asked questions
Can you die from sleep paralysis?
No. Breathing continues automatically, and the state passes by itself within seconds or minutes.
Why does it feel like someone is there?
The brain is on the border between sleep and waking and fills in images from the dream. It is not mysticism but a feature of the state.
How can I prevent sleep paralysis?
Regular, sufficient sleep, less stress and avoiding sleeping on your back if episodes happen in that position.