NUR 102 - EXAM 4 (Module I) with 100% complete solutions already graded A

Rest * Conserves and restores energy * Relieves stress * Produces enjoyment & relaxation Sleep * State of altered consciousness * Restores energy * Provides time for repair and recovery of body systems 00:17 01:28 Circadian Rhythms * 24-hour, day-night cycle * Natural secretion of melatonin helps to ensure a smooth transition from wakefulness to sleep. Biological clock An internal mechanism in organisms that controls the regularity of various functions, such as sleep cycle. Sleep Regulation * Sleep involves a sequence of physiological states maintained by the CNS. * Reticular Activating System (RAS) * Two Process Model - Homeostatic process - Circadian Process Homeostatic Process (Process S) * length/depth of sleep Circadian Process (Process C) * organization of sleep Stages of Sleep - NREM sleep - REM sleep NREM Sleep * non-rapid eye movement * involves 4 stages REM Sleep rapid eye movement Stage 1: NREM * Lightest level of sleep * Lasts a few minutes * Easily aroused by sensory stimuli * If awakened, person feels as though daydreaming has occurred Stage 2: NREM * Period of sound sleep * Relaxation progress * Arousal is still relatively easy * Stage lasts 10-20 minutes * Body functions slow - Rolling, shifting position - Low level muscle movements in neck & jaw 00:01 01:28 Stage 3: NREM * Involves initial stages of deep sleep * Sleeper is difficult to arouse and rarely moves * Muscles are completely relaxed * VS decline but remain regular * Lasts 15-30 minutes Stage 4: NREM * Very difficult to arouse sleeper * Deepest stage of sleep * If sleep loss has occurred, sleeper will spend considerable portion of night in this stage * VS are significantly lower than during waking hours * Lasts approximately 15-30 minutes * Sleepwalking and enuresis may occu * Bed wetting can occur REM sleep * Vivid, full-color dreaming may occur * Usually begins about 90 minutes after sleep has begun. * Typified by autonomic response of rapidly moving eyes, fluctuating heart and resp. rates, increased or fluctuating BP. * Loss of skeletal muscle tone occurs * Gastric secretions increase * Very difficult to arouse * High brain activity - sleep paralysis Duration of REM sleep is what with each cycle? Averages ? * increased with each cycle * averages 20 minutes