Sleep is an active nerobiological precess regulated by interaction of Ascending reticular activating system ,VLPO,Process -C and Process-S
Wakefulness occurs by two ARAS-Ascending reticular activating system of brainstem
Sleep starts with deactivation of ARAS by Galanin and GABA secreted by hypothalamic VLPO
Awake state is maitained by hypocretin,also called orexin which is a switch stabiliser
Two process regulation–Process -S-Homeostasis= makes pressure for sleep partly reg-
ulated by adenosine ,the level of adenosine in body rises with insreasing duration of wakefulness
Procees-C-Circadian process- keeps a person sleepy when there is low pressure of sleep in early morning by process-S. Process C operates through suprachiasmatic nucleus and synchronised by light . In low light melanin is secreted more which promotes sleep
Sleep is essential for neurodevelopment,growth,congnitive function and memory of children
