NUR 1211C Chapter Notes - Chapter Test 1: Reticular Formation, Non-Rapid Eye Movement Sleep, Sleep
8 Feb 2020
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Document Summary
Sleep: sleep is a state in which an individual lacks conscious awareness of environment surroundings but can be. Insufficient sleep refers to obtaining less than the recommended amount of sleep. Fragmented sleep refers to frequent arousals or actual awakenings that interrupt sleep continuity. Nonrestorative sleep refers to sleep that is of adequate duration but does not result in the individual feeling refreshed and alert the next day: sleep disturbance is a term used broadly to indicate conditions of poor sleep quality. A cluster of neuronal structures in the middle brainstem, called the reticular activating system (ras), is associated with generalized cortical activation and behavioral arousal. Orexin (also called hypocretin) in a neuropeptide found in the hypothalamus. Orexin is involved regulating the sleep-wake cycle and plays a role in keeping people awake. Decreased levels of orexin or its receptors lead to difficulties staying awake, which is a syndrome called narcolepsy: sleep behavior.
