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Sleep paralysis

John Henry Fuseli's 1781 painting the Nightmare shows typical symptoms of sleep paralysis: heavy breath, limp muscles and hallucinations.[1]

When people are dreaming, their muscles do not move, even if in their dream they are moving. This is a natural process which prevents that people actually perform the movements they do in their sleep. In general, people are not aware of this inability to move, as it usually stops as soon as they wake up. People suffering from sleep paralysis wake up and find that they are unable to move. This is because the paralysis has not stopped. Usually it lasts for only a few minutes, and people have said they feel a "presence" or "ghost" during it.

  1. ↑ J. M. Schneck: Henry Fuseli, nightmare, and sleep paralysis. In: JAMA. Band 207, Nummer 4, Januar 1969, S. 725–726, PMID 4883518.

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