Sleep deprivation is proven to impair neurological function, which makes President Trump’s boast that he only sleeps four hours a night one of his few claims we should trust. What’s worrying for anyone who still supports him — and the rest of the world if he’s re-elected — is that Trump‘s proclivity for late nights appears to be growing. And it’s both making him angry and affecting his public performance. That’s according to a new analysis of Trump’s social media activity by Columbia University researchers Douglas Almond and Xinming Du, who compared how the president‘s late-night tweets with his mood and re-election odds. Their findings…

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