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Greek historian Procopius of Caesarea linked delirious hallucinations with insomnia and coma as early as AD 542. He believed that people who suffer from hallucinations are violent and hyper - excited whilst sleepwalking.
Procopius claimed that victims often experience disturbing omens and visions of a supernatural being human form (sometimes a headless man) who would touch them, thus passing the disease.
He also stated that victims
of delirium do not feel any pain and are therefore lucky.
From a medical point of view, beside all the nonsense, his observations from AD 542 originate long-standing theories about sleep disorders which in extreme cases cause hallucinations.