An analysis by Stellar Sleep examined changes in sleep patterns of 3,810 individuals before and after the daylight saving time shift in March 2024, focusing on sleep latency and duration.

Stellar Sleep, which offers a digital solution for chronic insomnia management, completed an analysis of sleep data from 3,810 individuals, specifically looking at sleep patterns three days before and three days after March 10, 2024—the day most of the US turned its clocks forward one hour for daylight saving time.

The analysis showed that the time change affected sleep latency the most, and people needed an extra 22 minutes to fall asleep, doubling the national sleep latency average. The data also showed that daylight saving time impacted sleep duration, reducing it by 7%.

Specifically, the daylight saving time data showed:

  • Sleep latency, described as the time it takes a person to fall asleep, was an extra 22 minutes because of daylight saving time. The average US sleep latency is about 15-20 minutes, so sleep latency basically doubled.
  • Data shows 27 minutes less sleep duration among people, partially driven by an increase in sleep latency. The average US sleep duration is about seven hours, so sleep duration decreased by about 7% because of this year’s daylight saving time in March.

25 million Americans suffer from chronic insomnia, defined as sleep problems three-plus nights a week for three-plus months,” says George Wang, co-founder and CEO of Stellar Sleep, in a release. “Moderate insomnia and other sleep issues are key warning signs and can lead to chronic insomnia. Many sleep experts have advocated the elimination of daylight saving time, and this data shows why. The spring time change significantly impacted sleep latency and quality for many people.”

Stellar Sleep previously found the fall time change also increases symptoms of insomnia.

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