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To the Editor:
Growing literature suggests REM sleep dysfunction in PD, in which a high prevalence of REM sleep disorders or excessive daytime sleepiness with REM sleep onset have been observed.1 Arnulf et al.2 suggested that some of the hallucinations occurring in nondemented parkinsonian patients are due to abrupt REM intrusions into wakefulness and should be considered a narcolepticlike phenomenon.
This interesting concept had already been anticipated in 1958 by the Italian neurologists Carlo Berlucchi (1897–1992) and Paolo Pinelli (born 1921) while studying sleep alterations in neurologic conditions. Because their investigations were published only in local scientific press3,4⇓ and are unknown to the neurologic community, we briefly summarize their findings. Berlucchi and Pinelli programmed “EEG investigations in various neuropsychiatric disorders to find out which of these are similar to the EEG sleep dream pattern described by Dement and Kleitman.”5
The most interesting case studied by Pinelli …
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