The study, published after analyzing data from nearly 3,700 adults over an average of 7 years, found that longer naps and inconsistent napping schedules were associated with a significantly higher risk of death. Participants who took naps lasting more than 30 minutes, or whose nap durations fluctuated greatly day-to-day, had a markedly higher risk of all-cause mortality.
Researchers emphasized that naps taken between 11 a.m. and 3 p.m.—a common mid-day rest period—were particularly associated with increased risk, suggesting that the body’s circadian rhythm may be disrupted when sleep occurs outside optimal windows or without regularity.
Objective Sleep Tracking Changes the Game
Unlike many past studies relying on self-reported habits, this research used wearable technology to track sleep and wake patterns over a week. The devices provided accurate data on the length, timing, and variability of daytime naps.
With each increase in nap length or irregularity, the risk of death rose by 14–20 percent, researchers said. While the study doesn’t suggest that napping directly causes death, it underscores the role of nap behavior as a biomarker of declining health or undiagnosed disorders.
Naps Are Not the Enemy—But Context Matters
Short, consistent power naps under 30 minutes are not considered risky. In fact, brief naps may improve alertness, memory, and mood. However, frequent long naps or irregular daytime sleep may signal poor nighttime sleep, undiagnosed conditions like sleep apnea, early dementia, or cardiovascular issues.
“We’re not saying naps are bad,” said study co-author Dr. Hassan Dashti. “Rather, we’re highlighting that how and when you nap could reflect bigger health concerns.”
The Public Health Perspective
The findings may have important implications for aging populations and shift workers. Medical professionals suggest those who regularly feel the need for long naps should speak with their doctor to rule out underlying causes.
This research offers a nuanced view of a common behavior often brushed aside. It doesn’t call for eliminating naps, but rather urges awareness and consistency—especially as we age.