The brain work at risers is very late and "morning larks" during different working hours, according to inspection.
Inspectors inspected the night owls with a bedtime at 02:30 and a 10:15 cleaning time, along with early builders.
The tests – carried out between 08:00 a.m. and 20:00, found that the owls had a smaller connection in brain regions associated with maintaining awareness.
They also had poor attention, slower reprints and more distress.
Researchers said that it was recommended that the owls were unfit with the "constraints" of the ordinary day.
They ask for more research to understand the health effects of owls on a work program or school that is not suited to them naturally.
& # 39; A & # 39; hitting an interesting rhythm & # 39;
Scientists gave 38 nightmates or morning lakes (people who went to bed just before 23:00 and woke up at 06:30) and explored the brain work at a surplus with to & # 39; using magnetic re-imaging (MRI) imaging scans.
Volunteers provided a series of work at various times, from 08:00 a.m. to 20:00, and they were asked to report their quiet levels.
The morning mills were as fragile and their fastest response time in the morning exams. It was also found that their performance was much better at this time than night owls.
In comparison, the owls were so fragile and their fastest response time at 20:00, although they did not do much better than the windows at this time.
The bond of the brain was in the areas that left better performance and the silence of the cell; heightened in windows everywhere, saying that late-rise commitment has been detrimental throughout the day, researchers said.
The researcher, Dr Elise Facer-Childs, at the University of Birmingham Center for Health of Scotland, said the results could "be led by the fact that the owls are overnight. ; endangered throughout their lives ".
Dr Facer-Childs said: "Night owls throughout the school need to rise earlier, and they go into work and they need to get up earlier, so they need to go to # 39 ; fight against their choice and the exciting rhythm. "
She said there was an "essential need" to make a better understanding of how to change the school and times of work that are not suitable, affecting health and product.
About 40-50% of the population recognize their choice for sleeping periods later and to get up after 08:20, researchers said.
Dr Facer-Childs said: "There may be a normal day from 09:00 a.m. to 5:00 p.m., but for an evenings, this may mean a reduction to achieve during the morning, lower brain connectivity in areas that are related to awareness, and increase day-to-day silence.
"If, as a society, we can be more flexible in how we can manage time, we could continue to increase productivity and reducing health risks. "
Dr Facer-Childs said that the differences in brain bonding are not a type of damage and may be recycled.
There are also some constraints for the study.
The tests did not look at brain work later on a day-to-day basis, and the other factors that were not raised in the study, such as lifestyle choices, could have an impact on the results.
Dr Alick Nesbitt, an unidentified expert at King's College, London, who was not involved in the investigation, said that the investigation has made evidence that the impact of human beings is performed, only by daytime but also on their body clock.
"It's becoming increasingly clear that these factors are important when practices 9 to 5 are widely distributed," he said.
The study authors requested further research to look out that other brain divisions might have an impact on their ability to investigate. Grow night night or night.
Their inquiry is published in the Sleep magazine.