Scientists typically see these effects in studies where they force people to stay awake for 24 hours, but Eti Ben Simon, a research scientist at the Center for Human Sleep Science at the University of California, Berkeley, said that if you just take away an hour or two for a couple of nights, you end up seeing the same profile emerging.
Sleep deprivation can also ramp up the sympathetic nervous system, which controls the fight or flight response, causing us to feel stressed and on edge. Our blood pressure and heart rate response and cortisol response, all of these components of the sympathetic nervous system are increased without sleep, Dr. Ben Simon said.
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