Finding out if person is asleep

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[-] John Doe +0 points · almost 2 years ago

Is there a good way to determine if person is asleep by some physical parameters ( not using brainwaves ). I'm aware of sleep tracking devices which are not very accurate since they use movement. Also things like breathing, blood pressure etc. could be misinterpreted, especially in REM. So is there any parameter or combination of those that will always differ ? I'm not interested in which sleep phase person is, but only if he's asleep or not.

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