Definition of "atonia" []

• Lack of muscle tone. (noun)

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• "Often called a nightmare, isolated sleep paralysis is not considered a sleep disorder (as when it occurs with narcolepsy), but rather an extremely disconcerting intrusion of the atonia, or paralysis, of REM sleep carried over into your waking state."
• "The muscle atonia prevents individuals from physically carrying out their dreams."
• "For instance, when humans dream that they are running, they are unable to actually run in reality because of muscle atonia."