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These systems include the orbital surface of the frontal lobe, the basal area of the forebrain, including Hess' hypnogenic zone, the medial thalamic nuclei, caudate nucleus, and caudal part of the medulla oblongata.
When you are drifting off to sleep or just waking up, you are in a hypnogenic state, between sleep and wakefulness.
Influence of hypnogenic brain areas on wakefulness- and rapid-eye-movement sleeprelated neurons in the brainstem of freely moving cats.