Health Impacts of Daylight Saving Time

Mar 6, 2025

How Springing Forward to Daylight Saving Time Could Affect Your Health and How to Prepare

Introduction

  • Daylight Saving Time (DST): Most of the U.S. adjusts clocks forward, losing an hour of sleep.
  • Health Impacts: Can lead to sleep disturbances and other health concerns such as heart attacks and strokes.
  • Circadian Rhythm Disruption: Affects sleep patterns and overall health.

Daylight Saving Time Details

  • Start Date: Begins Sunday at 2 a.m.
  • End Date: Clocks revert on Nov. 2.
  • Exemptions: Hawaii, most of Arizona, Puerto Rico, American Samoa, Guam, and the U.S. Virgin Islands do not observe DST.

Effects on the Brain

  • Master Clock: Controlled by exposure to light and darkness, influencing sleepiness and alertness.
  • Circadian Rhythm: A 24-hour cycle impacted by age, influencing when we feel drowsy or alert.
  • Melatonin: Hormone that induces sleep, delayed by evening light due to DST.

Health Implications

  • Fatal Car Crashes: Increase after DST starts, particularly in the morning.
  • Heart Health: Higher incidence of heart attacks and strokes in the days following the start of DST.
  • Monday Connection: Heart attacks are generally more common on Monday mornings due to blood clot propensity.

Preparing for Daylight Saving Time

  • Gradual Adjustment: Shift bedtime and wake time 15-20 minutes earlier for several days before DST.
  • Morning Sunshine: Exposure to early morning light helps reset the internal clock.
  • Routine Adjustments: Alter schedules for meals and exercise to help the body adapt.
  • Avoid Disruptors: Limit naps, caffeine, and evening electronic device use.

Discussion on Eliminating Time Changes

  • Ongoing Debate: Annual discussions on ending DST.
  • Political Actions: The Sunshine Protection Act aims to make DST permanent, but has stalled in Congress.
  • Health Recommendations: Some health organizations recommend permanent standard time for better alignment with human biology.