A 19-year study links one sleep habit to lower mortality risk. Researchers tracked sleep patterns across nearly two decades and found that people who napped excessively showed higher death rates compared to those who napped rarely or moderately.
The study examined napping duration and frequency among thousands of participants. Excessive daytime napping, defined as naps longer than one hour or occurring more than three times weekly, correlated with increased mortality from all causes. The researchers controlled for factors like age, obesity, and sleep apnea to isolate napping's independent effect.
Scientists don't fully understand the mechanism. Excessive napping may signal underlying health problems like sleep apnea, depression, or cardiovascular disease rather than cause death directly. Short, occasional naps of 30 minutes or less showed no mortality link.
The findings apply primarily to older adults and those with existing health conditions. Healthy people taking brief strategic naps appear unaffected. Experts recommend discussing frequent long naps with a doctor, as they warrant investigation for sleep disorders or other medical issues.
This research doesn't mean all napping harms health. Context matters. People experiencing persistent daytime sleepiness should seek evaluation rather than accept fatigue as normal.