what is its effect on our health?

On the night of Sunday, March 27, our phones and other connected devices will jump in time by one hour. The time displayed on the screens will automatically change from 2:00 AM to 3:00 AM in accordance with daylight saving time. While for most people this change in time would have little or no visible impact, several studies highlight, however, that this may be due to the impact on our The biological clock and significant consequences for our health.

The scientific literature shows that time change does have physiological and medical implications: it affects our internal biological clock (called the circadian system) and can have harmful effects on our health (sleep problemsvigilance, accidents work and travel, depression, myocardial infarction and cerebrovascular accidents).

The body’s adaptation to this jet lag that we impose on it will vary from one person to another and can take several days. chronotypes in the morning (people who are more efficient in the morning), up to several months for late chronotypes (people who are more efficient in the evening). In the context of this change in time, young children and the elderly are more likely to experience negative effects, but this also applies to teenagersfrom night workersand all those who suffer from sleep and who will find it more difficult to adapt to the new schedule.

Dysfunctional night owls

Moreover, according to experts such as neuroscientist and Inserm researcher Claude Gronfier, president of the French Society of Chronobiology, the transition to daylight saving time will be more difficult for the body to manage than the transition to the “clock”.wintertaking into account, on the one hand, the loss of one hour of sleep, and on the other hand, the fact thatThe biological clock should be moved forward by one hour.

On average, our bodies are 10 minutes behind their 24-hour cycle. With the change in time, they will be asked to speed up their rhythm by one hour, which will highlight the efforts our bodies are making to try and catch up. This change will be especially painful for the latest chronotypes, which register an average of 30 minutes behind their 24-hour cycle. The impact of daylight saving time on our circadian rhythms will increase general lack of sleep population of France, according to studies, from 30 to 90 minutes a day (60 minutes according to barometer 2022 from the National Institute of Sleep and Wake).

Why keep summer and winter time?

Removing the seasonal change of time was voted in 2019, member states of the European Union must now choose which final time to accept. The vast majority of the scientific community recommends making a choice bears to keep winter time.

If we kept DST all year round, waking up in the winter and going to bed in the summer would be really harder. On the shortest day of the year (December 21st) Sun in Paris got up at 9:41 (instead of 8:41 standard or “winter time”), and this very late sunrise in this season winter would have a detrimental effect on the health of the French, the adjustment of our biological clock is also influenced by light.

When we wake up, our body needs a large dose of light to start a new day and synchronize the biological clock. Thus, he would have been deprived of this light in winter with a later sunrise.

On the other hand, if winter time then sunset in summer will occur on average 4 hours later than in winter instead of 3 hours at the current time change, and will cause an earlier sunset and longer sleep, which will be good for our health.

Work on the Importance of Impact light on the circadian cycle are conducted at the Lyon Research Center for Neurology. The research team, in particular, noticed that certain exposure to light at certain times has a beneficial effect on sleep physiology and non-visual functions of the body, such as: secretion melatonin (a hormone controlled by the circadian clock and involved in the regulation of sleep), pupillary reflex, brain activity, temperature and cardiovascular system, even when very short excerpts and very low light

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