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Sleep Stages PowerPoint Presentation

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Description : This sleep ppt presentation is about sleep stages

Tags : Sleep,about sleep, types of sleep,sleep apnea,sleep stages

Published on : Nov 08, 2021 | Views : 1284 | Downloads : 3

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sleep Stages
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SLEEP DEFINATION It is natural periodic state of rest for mind and body, in which the eyes usually close and unconsciousness is completely or partially lost, so that there is decrease in bodily movement and responsiveness to external stimuli. A state of unconsciousness but still able to awaken by normal sensory stimuli. O2 level in brain is increased than in normal waking state. Regulated by hypothalamus. Pineal gland releases melatonin which controls sleep awake cycle known as circadian rhythm.
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TYPES OF SLEEP NREM AND REM NREM sleep It happens first and includes three stages. The last two stage of non-REM sleep is when you sleep deeply. It’s hard to wake up from this stage of sleep. Stage 1: This stage of light sleeping lasts for five to 10 minutes. Everything starts to slow down, including your eye movement and muscle activity. Your eyes stay closed. If you get woken from stage 1 sleep, you may feel as if you haven’t slept at all. You may remember pieces of images. Sometimes, you may feel like you’re starting to fall and then experience a sudden muscle contraction. Healthcare providers call this motion hypnic myoclonic or hypnic jerk. Hypnic jerks are common and not anything to be concerned about as this occurrence is unlikely to cause any complications or side effects.
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Stage II sleep (Light sleep EEG features of stage II sleep include; Sleep spindles K complexes Vertex waves (early stage ii sleep) 4-7Hz theta in the background. Low chin tone. Posts often persist.
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Stage III (deep sleep) It is not recorded during routine EEG recording. However, it is seen during prolonged EEG monitoring Amount of slow wave sleep decreases as age increases 20-29 years : 21% of total sleep 40-49 years : 8% of total sleep 60-69 years : 2% of total sleep
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Stage iii sleep
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REM (rapid eye movement) EEG characteristics of REM sleep are; Low voltages and faster activity of mixed frequencies (alpha, beta etc) Resemblance to awake record EEG desynchronization Rapid eye movement Saw tooth waves
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