There is no relationship between the duration of sleep and our state of fatigue. This is the result of three studies conducted by Swedish physician Torbjörn Äkerstedt and his team. By analyzing the sleep quality of 6,000 people, these researchers were able to conclude that a person's condition does not depend on the number of hours of sleep. "People in their twenties can sleep even more, while feeling tired in the daytime as their brains develop further," says the Swedish neurologist. "All this is conditioned by the genes and depends on the age and the state of health," he adds.

Genes therefore have a very important role in the quality of sleep. "Sleep is very genetically determined. It is one of the most profound genetic components of the human experience, "says Dr. Äkerstedt. While in France, the average sleep time of the French is 7:05 on weekdays, that of Swedes is 6:55. For young people aged 18 to 25, it lasts more than 8 hours, whereas it is 6:10 for a 60-year-old. "The reason for this fatigue is that the brain is developing and they still have a lot to learn," says the Swedish neurologist when talking about young people.

Whatever the age or the discomfort, it is essential to take some precautions to reduce the risks of having a night's sleep such as the taking of vitamin supplements or the practice of a sport during the day. Moving away from LED lights and TV is just as important!