Abstract
Orexin is a neuropeptide that plays a highly important role in mechanisms that regulate sleep/wake states. Lack of the orexin gene or orexin-producing neurons (orexin neurons) results in narcolepsy in several mammalian species, suggesting that orexin is an important factor for the maintenance of wakefulness. Constitutive, ectopic expression of orexin in transgenic mice resulted in severe fragmentation of non–rapid eye movement sleep, along with abnormal muscle tone regulation during REM sleep, suggesting that activity of orexin neurons should be appropriately decreased during sleep to maintain consolidated sleep states. This review will discuss the mechanisms by which the orexin system is regulated during sleep.
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