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Phatigus t1_izutoaz wrote

We certainly do know. If you have absolutely zero sleep, you die.

Most ailments that severely impact sleep make it ‘likely’ that they died from lack of sleep, but not for sure. An easy way to tell is physically stop someone from sleeping, which has become more common than water boarding or other traditional forms of torture. 5-6 days of 100% wakefulness and they die.

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