More than a third of American adults aren’t getting enough sleep. And while some may think spending less time snoozing is no big deal, sleep physicians say that’s not the case.Most adults need at least seven hours of sleep each night. Some may think they can train their bodies to get less sleep or counter sleepiness with caffeine, but that doesn’t mean their body doesn’t need the ZZZs, said Dr. Marlene Dietrich, medical director of the PeaceHealth Southwest Medical Center sleep lab.“It’s rare that people can feel good with less than six (hours),” she said. “Your body may adapt to it, but it doesn’t mean it doesn’t need it.”Not getting enough sleep can not only affect wakefulness the next day, but it can mean you’re less alert and focused, putting you at a much higher risk for accidents, Dietrich said. Studies have also linked getting less than seven hours of sleep per night to an increased risk of obesity, diabetes, high blood pressure, coronary heart disease and stroke, according to the Centers for Disease Control and Prevention.In a national survey, about 68 percent of Washington adults reported getting at least seven hours of sleep each night. That’s higher than the national median of 65 percent, according to the CDC.