6 Ways Your Health Takes A Hit After A Single Night Of Bad Sleep

By Jenn Sinrich, Feb 14, 2025

Insufficient sleep also causes cortisol—the stress hormone—to go into overdrive, which keeps your body stuck in high-alert mode, making you feel more anxious, irritable, and generally on edge, according to Alex Dimitriu, M.D., a physician double board-certified in psychiatry and sleep medicine and founder of Menlo Park Psychiatry & Sleep Medicine. “Without proper rest, cognitive processes like memory, decision-making, and reaction time slow down, which explains why sleep-deprived individuals often struggle to focus, feel emotionally unstable, and experience increased sensitivity to stress,” he says. 

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