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Especially for those who often stay up at night, taking a nap during the day is considered a renewal of life.
Michigan State University "Sleep and Learning Laboratory" researchers conducted a series of experiments to evaluate cognitive deficits related to lack of sleep. They recently published a study result that tells us that for people who stay up late, just a few tens of minutes of nap, the brain can not recover awake .
▲The research results were published in Sleep, a well-known journal in the field of sleep
In this study, nearly 280 young people who participated in the experiment were randomly divided into three groups, one group went home to sleep that night, and the other stayed Stay up all night in the laboratory, and one group is allowed to take a 30-minute or 60-minute nap after staying up all night.
Before and after going to bed/staying up late, these young people need to complete several specially designed intelligence tests, which mainly examine alertness, attention, coherence of multi-task switching process and memory ability.
It is not difficult to imagine that those young people who had been staying for the whole night appeared "brainless" the next day, and the performance of the second test obviously declined. However, people who take a 30-minute or 60-minute nap are not much better, and make mistakes frequently in the intelligence test . Data analysis showed that, compared with the “overnight” group, the “snooze” group did not significantly improve the measured cognitive indicators, and did not alleviate the damage to cognitive ability caused by sleep deprivation .
▲So sleepy, I can't move my mind (picture source: 123RF)
Seeing this, does it mean that nap is useless, and it is "abandoned"?
research leader Professor Kimberly Fenn said: "Although nap does not significantly alleviate the adverse effects caused by sleep deprivation, we found that the slow wave sleep obtained by during nap, and reduce the damage caused by lack of sleep About .”
Slow-wave sleep refers to the deepest sleep and the most relaxed stage of the body during sleep. At this stage, people's heart rate and breathing are relatively slow. The brainwave shows the characteristics of high amplitude and low frequency. . Slow wave sleep is believed to have the greatest relationship with restoring energy.
Image source: 123RF
In this experiment, some participants quickly entered slow-wave sleep during a nap and stayed for a longer period of time. Relatively speaking, the number of errors in each test is also slightly lower. The results of the study show that for every 10 minutes of slow-wave sleep increase during nap, the error rate is reduced by about 4% in complex multitasking tests .
Although 4% is insignificant in the laboratory results, Professor Fenn emphasized that considering the work done by people who need to stay up all night in real life, such as surgeons, police, or coach drivers, even if it only reduces errors by 4% , It may also mean saving more lives. From this point of view, although can’t replace a full night’s sleep, if you have the opportunity to make up for sleep, you must make up for it as soon as possible .
▲Too little sleep, there are many more serious problems than dark circles (picture source: 123RF)
By the way,This research group also published an experimental result not long ago. Through a similar intelligence test, it was found that although drinking coffee after staying up late can make people feel more energetic, it is not helpful for complex tasks that require "braining" to complete_ span5span .
In short, taking a nap and drinking coffee is better than staying up late and staying up less.
Reference:
[1] Michelle Stepan et al., (2021) Slow-wave sleep during a brief nap is related to reduced cognitive deficits during sleep deprivation. Sleep Doi: https://doi.org/10.1093 /sleep/zsab152
[2] Scrap the nap: Study shows short naps don't relieve sleep deprivation. Retrieved https://www.eurekalert.org/news-releases/925202
[3] Michelle E. Stepan et al, Caffeine selectively mitigates cognitive deficits caused by sleep deprivation., Journal of Experimental Psychology: Learning, Memory, and Cognition (2021). DOI: 10.1037/xlm0001023
Note: This article aims to introduce the progress of medical health research,Not a treatment recommendation. If you need guidance on treatment plans, please go to a regular hospital for treatment.
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