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many normal people have hallucinations in that semi conscious period before being fully asleep. some people hear voices, some feel something on their body and some see things like your mother did. Any of the senses can be effected.
Its the closest to psychosis your mother will ever get, But you really don't have to worry about anything. probably the combination of the sickness, some stress and lack of sleep just got to her. It happens.
doubt it'll happen again once the sickness or stress is over with, but if she's awake and getting this all the time, its time for a psychiatrist.
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