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Physiology of sleep

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This document discusses the stages and physiology of sleep. It defines sleep as a state of unconsciousness that one can be aroused from, and coma as a state of unconsciousness that one cannot be aroused from. It describes the four stages of non-rapid eye movement (NREM) sleep - stages 1, 2, 3, and 4 - as well as rapid eye movement (REM) sleep. It provides details on the EEG patterns, duration, and characteristics of each sleep stage. Overall, it provides a comprehensive overview of the stages and cycles of sleep.

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PHYSIOLOGY OF SLEEP By: RAJNISH KUMAR CIMS BILASPUR
Definitions SLEEP: A state of loss of consciousness form which a subject can be aroused by appropriate stimulus. COMA: A state of unconsciousness form which a subject cannot be aroused.
SLEEP STAGE According to EEG criteria- 1. NREM(non-rapid eye movement) Stage 1 NREM Stage 2 NREM Stage 3 NREM Stage 4 NREM 2.REM(rapid eye movement)
Physiology of sleep
Physiology of sleep
STAGE 1 NREM NREM (non-rapid eye movement) sleep is dreamless sleep. Occurs at sleep onset or following arousal form another stage of sleep. 1 to 7 min in the initial cycle. 2 to 5% of total sleep. Easily interupted EEG: Rhythmic alpha wave.
STAGE 2 NREM Lasts for 10 to 15 min in initial cycle and lengthens with each successive cycle. 45 to 55% of total sleep duration. Arousal requires more intense stimulus then stage 1. EEG: Sleep spindles.
STAGE 3 NREM Lasts only for a few minutes. 3-8% of total sleep. EEG - High voltage, slow wave activity or delta wave
STAGE 4 NREM Lasts 20-40 minutes in the first cycle. 10-15% of total sleep. Arousal threshold is highest. EEG - high voltage slow wave activity-delta waves.Together with Stage 3 NREM - Slow Wave Sleep (SWS) Now, combined with Stage 3 NREM into single entity-N3 Stage
Physiology of sleep
REM Desynchronised (low frequency) brain wave activity. "Sawtooth" waveforms. Theta activity and slow alpha activity also characterise REM sleep. 1-5 minutes in initial cycle. Progressively prolonged as sleep progresses.
4-5 cycles of these sequential stages Each cycle -90-110 mins As sleep progresses delta sleep decreases and REM sleep increases. REM in initial cycle is only 5-10 mins but in last cycle can be as long as 40 mins As sleep progresses Stage 2 predominates in NREM sleep and Stage 3 & 4 sometimes disappear altogether.
Physiology of sleep
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Physiology of sleep

  • 1. PHYSIOLOGY OF SLEEP By: RAJNISH KUMAR CIMS BILASPUR
  • 2. Definitions SLEEP: A state of loss of consciousness form which a subject can be aroused by appropriate stimulus. COMA: A state of unconsciousness form which a subject cannot be aroused.
  • 3. SLEEP STAGE According to EEG criteria- 1. NREM(non-rapid eye movement) Stage 1 NREM Stage 2 NREM Stage 3 NREM Stage 4 NREM 2.REM(rapid eye movement)
  • 6. STAGE 1 NREM NREM (non-rapid eye movement) sleep is dreamless sleep. Occurs at sleep onset or following arousal form another stage of sleep. 1 to 7 min in the initial cycle. 2 to 5% of total sleep. Easily interupted EEG: Rhythmic alpha wave.
  • 7. STAGE 2 NREM Lasts for 10 to 15 min in initial cycle and lengthens with each successive cycle. 45 to 55% of total sleep duration. Arousal requires more intense stimulus then stage 1. EEG: Sleep spindles.
  • 8. STAGE 3 NREM Lasts only for a few minutes. 3-8% of total sleep. EEG - High voltage, slow wave activity or delta wave
  • 9. STAGE 4 NREM Lasts 20-40 minutes in the first cycle. 10-15% of total sleep. Arousal threshold is highest. EEG - high voltage slow wave activity-delta waves.Together with Stage 3 NREM - Slow Wave Sleep (SWS) Now, combined with Stage 3 NREM into single entity-N3 Stage
  • 11. REM Desynchronised (low frequency) brain wave activity. "Sawtooth" waveforms. Theta activity and slow alpha activity also characterise REM sleep. 1-5 minutes in initial cycle. Progressively prolonged as sleep progresses.
  • 12. 4-5 cycles of these sequential stages Each cycle -90-110 mins As sleep progresses delta sleep decreases and REM sleep increases. REM in initial cycle is only 5-10 mins but in last cycle can be as long as 40 mins As sleep progresses Stage 2 predominates in NREM sleep and Stage 3 & 4 sometimes disappear altogether.
  • 14. THANK YOU True education means fostering the ability to be interested in something.