Amanda Tyson-Ryba, a licensed psychologist at the University at Buffalo's Student Health Services, said that being perpetually connected through social media could intensify the tragedy.

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If you're really desperate for a boost in the eleventh hour, stick with coffee or tea rather than soda and energy drinks, which come with a sugar slump, says Helen Pak, registered dietician and nutritionist at University of California at Berkeley Student Health Services.

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Hasan "was clearly espousing Islamist ideology" during his time as a medical student at the Uniformed Services University of the Health Sciences in Bethesda, Maryland, one of his former classmates said.

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