![]() The noradrenergic cells of the LC inhibit REM sleep, promote wakefulness, and project to various other arousal-regulating brain regions, including the thalamus, hypothalamus, basal forebrain, and cortex. NE is released from norepinephrine-containing neurons of the locus coeruleus (LC). 5-HT is released from serotonin-containing neurons of the dorsal raphe nucleus. Cortical ACh release is greatest during waking and REM sleep and lowest during NREM sleep. ![]() Neurochemicals such as acetylcholine (ACh), dopamine (DA), norepinephrine (NE), serotonin (5-HT), histamine (HA), and the peptide hypocretin maintain the waking state. ![]() Adenosine also promotes sleep by inhibiting wakefulness-promoting neurons localized to the basal forebrain, lateral hypothalamus, and tuberomammillary nucleus. Sleep-promoting neurons in the anterior hypothalamus release GABA, which inhibits wake-promoting regions in the hypothalamus and brainstem. GABA is the primary inhibitory neurotransmitter of the central nervous system (CNS), and it has been well established that activation of GABA-a receptors favors sleep.
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