The U.S. formally adopted DST in the 20th century, though its relevance and effects continue to spark debate each year.
When DST ends, the mornings become brighter and the evenings darker — a welcome change for some but a disruption for others. While gaining an extra hour sounds like a bonus, experts say your circadian rhythm, the internal clock that regulates sleep and alertness, doesn’t reset instantly.
“Our circadian rhythm is guided by light and dark cues, not the time on the clock,” Dr. Lu explains. “So even though it’s 7:00 a.m. on your phone, your body still feels like it’s 8:00 a.m. for a few days.”
3 Common Issues Your Body May Face Adjusting to Daylight Saving Time
- You Wake Up Earlier
According to Harvard Health, many people find themselves waking up earlier than usual the day after the clock change. The internal clock remains slightly off balance, resulting in lighter, fragmented sleep. - You May Have Trouble Falling Asleep
As evenings grow darker earlier, your body produces melatonin, the sleep hormone, sooner than usual. The mismatch between your internal rhythm and the clock can make it difficult to fall asleep at your normal bedtime. - You Wake More During the Night
Your internal rhythm’s disruption can lead to more nighttime awakenings or restlessness. Dr. Lu recommends maintaining a consistent bedtime and keeping your sleep environment calm to help your body recalibrate.
Tips for Resetting Your Sleep Cycle
