i think it has double or tripple meaning:
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investigators who have seen the video / picture evidence and know the truth cant sleep because of the horror
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criminals who know the truth is about to get out cant sleep because of the panic.
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those who know about symbolism and see the fake news for what they are cant go back into sleeping mode. like in the 80s movie: "They Live" - We Sleep… alarms going off Beep beep