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Human Factors sleep cycles

  • Dave.dc
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Dave.dc created the topic: Human Factors sleep cycles

In your human factors and limitations book on page 99 you state that there are only 4 stages of sleep. Online aviation theory aswell as other sources suggest there are 5.
Could you confirm please ?
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bobtait replied the topic: Human Factors sleep cycles

It all depends on whether you classify REM (rapid eye movement) as a separate stage of the sleep cycle or as a characteristic of stage 4 sleep. The research I did initially classified REM as being part of stage 4 sleep. I note that a Google search for 'stages of sleep' shows many publications that still indicate four stages with REM included in stage 4 sleep. Can you advise the other publications you have found the indicate five stages. Thanks for your feed-back. It is appreciated.
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  • Dave.dc
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Dave.dc replied the topic: Human Factors sleep cycles

It seems that different sources have different opinions as two stages are quite similar and people count them as one. However it looks like technically it's 5 stages.

sleepfoundation.org/sites/default/files/SleepWakeCycle.pdf

See page 9

Thanks
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