Sleep regulation

Sleep regulation is a complex, multiscale physiological process that coordinates the timing and quality of sleep and wakefulness across the 24-hour day. Rather than being a single molecular target, it is governed by the "two-process model," which involves the interaction of the circadian rhythm (Process C), regulated by the suprachiasmatic nucleus, and the homeostatic sleep drive (Process S), which tracks the accumulation of sleep-inducing substances like adenosine (NIH/NINDS, 2023; Borbély et al., 2016). On a molecular level, this system utilizes a diverse array of neurotransmitters and receptors, including the inhibitory GABAergic system, the wake-promoting orexin (hypocretin) and histamine systems, and the chronobiotic melatonin system (StatPearls, 2023). Pharmacological intervention in sleep regulation involves targeting these specific pathways to treat conditions such as insomnia, narcolepsy, and circadian rhythm disorders (PMC, 2022). Drugs such as GABA-A receptor modulators, orexin receptor antagonists, and melatonin receptor agonists are commonly used to induce or maintain sleep by shifting the balance between arousal and sleep-promoting circuits (PubMed, 2023). Because "Sleep regulation" encompasses an entire biological state and multiple discrete receptors, it is characterized as a physiological process or therapeutic area rather than an individual therapeutic target molecule.

Other names

Sleep-wake cycleSleep-wake homeostasisCircadian regulation of sleepSleep-wake regulation

Sleep regulation is modulated through several distinct mechanisms including positive allosteric modulation of GABA-A receptors, antagonism of Orexin-1 and Orexin-2 receptors, agonism of Melatonin MT1 and MT2 receptors, and antagonism of Histamine H1 receptors.