Medical Detecting Early Signs of Sleep: What to Look For?

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The discussion centers on developing a cost-effective, non-invasive device to detect the onset of sleep in individuals. Key physiological changes associated with the transition to sleep include alterations in heart rate and brain wave activity, though these methods face challenges in reliability and invasiveness. The user seeks additional insights into physiological indicators that could signal the early stages of sleep, particularly the first and second stages of NREM sleep. The conversation emphasizes the need for affordable and practical detection methods that can be applied universally across different individuals.
taylaron
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Hi PF, I need some help. I'm studying to be an electrical engineer and I'm trying to make a cheap, non-invasive device that can detect when a person is starting to fall asleep. The device should be able to work on any person and perform a task before they can fall asleep.

*Can anyone tell me what happens physiologically when a person starts to loose consciousness?

As a bonus, it would be extra helpful if you know a way to easily and cheaply detect it.

What I know:
rapid eye movment- unusable beacuse the person is too far into sleep
slowing heart rate- differs from person to person and is dependent on prior physical activity. unreliable?
brain waves change- too invasive to detect and costly.
Any more?
Thoughts?

Much thanks,
Taylaron.
 
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Bueller? ... Bueller?... Bueller? ...

Does anyone have a thought on detecting the first and second stage of NREM sleep?

Much thanks,
-Tay
 

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