We'll lose an hour of sleep as we “spring forward” this weekend, turning our clocks an hour ahead on Sunday morning. And while we'll gain an extra hour of daylight in the evenings, we'll lose it in the morning—waking up, and maybe even heading off to work or school, before the sun comes up.
An hour may not seem like a lot, but the time shift can have significant effects on the body, says Dr. Sandhya Kumar, assistant professor of neurology and medical director of the Sleep Disorders Center at Wake Forest Baptist Medical Center in North Carolina. “With the spring time change, you essentially have to go to bed earlier and get up earlier, which is difficult for many of us to do,” she says. “Most of us end up losing 40 to 50 minutes of sleep those first few days—and as a nation that’s significantly sleep deprived to begin with, even that little change can impact health.”