Studies of encephalitis lethargica suggested that the

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Studies of encephalitis lethargica suggested that damage to the posterior hypothalamus leads to excessive sleepiness while damage to the anterior hypothalamus leads to insomnia. Therefore, the posterior hypothalamus promotes wakefulness while the anterior hypothalamus promotes sleep. The basal forebrain is involved in the regulation of many functions including sleep, but it mainly promotes non-REM sleep and inhibits wakefulness.

Studies of Encephalitis Lethargica Suggested That the