Daylight saving time has kicked in and a Mayo Clinic expert says that seemingly small change can significantly affect the body.

“We have more difficulty springing forward than we do falling back,” said Dr. Brynn Dredla, a Mayo Clinic sleep neurologist.

She added that many likely noticed the impact on the Monday commute because, “If someone sleeps from 10 p.m. to 6 a.m. and then we spring forward, on Monday morning we’re asked to now be driving when we should normally be sleeping,” she says. “So that can be a big impact because our body is under the impression it should be asleep when we’re asking it to perform a pretty complex task.”

The body’s internal clock, or circadian rhythm, no longer matches the external clock, which causes many to feel sluggish and foggy-headed, but Dr. Dredla explained that the impact doesn’t last long, ” And it usually takes two days before we’re able to get back into our normal routine.”