10 Weird Signs You're Sleep-Deprived

You know the obvious signs: the heavy eyelids, the third cup of coffee before 10 a.m., the foggy feeling that won’t lift. But sleep deprivation has a way of showing up in places you’d never think to look—including in your appetite, your mood, your jaw, and even your bladder. “I can look at almost any organ in the body,” says Dr. Saema Tahir, a sleep disorder specialist in New York, “and say, ‘Well, that could be related to something in sleep.’”Yet most of us never connect these symptoms to what’s happening (or not) overnight. We asked experts which overlooked signs could point to a sleep problem—and how to spot them early.You have ADHD-like symptomsSome sleep specialists say that undiagnosed sleep disorders—especially obstructive sleep apnea—can mimic or worsen ADHD symptoms, especially in kids. Not getting enough sleep can trigger or exacerbate problems with attention, behavior, and impulse control, says Dr. Alice Hoagland, director of Rochester Regional Health’s sleep disorder clinic. In many cases, she says, a tonsillectomy resolves a child’s apnea, and the ADHD symptoms vanish with it.The same dynamic can play out in adults: Nearly 80% of adults with ADHD have a delayed circadian rhythm, which means their internal clocks are shifted later than average, making it hard to fall asleep until late at night. “They stay up until 1 or 2 in the morning,” Hoagland says. “They attribute staying awake to their ADHD—but in point of fact, these people are simply not sleepy.” When work forces them up at 6 or 7 a.m., they become chronically sleep deprived, with symptoms indistinguishable from ADHD. There’s even a genetic component: A mutation on a gene called CRY1 is associated with inherited delayed sleep phase—meaning for some people, the most effective fix isn’t medication, it’s restructuring their schedule to match their biology.AdvertisementYou crave junk foodThat 11 p.m. pull toward chips or ice cream after a bad night’s sleep isn’t a lack of willpower. It’s hormones. Sleep deprivation disrupts the balance of two key appetite hormones: ghrelin, which drives hunger, and leptin, which signals fullness. In one study, “short sleep was linked to lower leptin, higher ghrelin, and higher self-reported hunger,” says Dr. David Benavides, a sleep medicine physician at Harvard Medical School and Mass General Brigham. “So the body is basically sending a stronger ‘eat’ signal and a weaker ‘I’m full’ signal. The two are not a great combination.” Read More: 8 Signs You’re the Problem in Your ArgumentsSleep deprivation also shifts the brain’s reward system toward high-calorie foods. “I remember when I was in residency, I would work 24-hour shifts, and I swear I would always go to the call room and look for doughnuts,” he says. Research suggests sleep deprivation can lead to eating roughly 300 extra calories per day—enough to make a meaningful difference over time, even if the rest of your diet hasn’t changed.AdvertisementYou’re way more emotional than usual Have you ever snapped at someone you love and thought, “Where did that come from?” There may be a neurological explanation. One study found that sleep deprivation caused the amygdala to react about 60% more strongly to negative stimuli, while simultaneously weakening the brain region that helps regulate those reactions. “The emotional parts of the brain react more strongly, and the systems that help regulate those reactions—they just don’t work as well,” Benavides says. “When patients say, ‘I get cranky…

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