There have been a couple of experiments: A chronobiologist
did an experiment with a German industrial company where he allowed people to configure their day based on their chronotypes and, not surprisingly, satisfaction and productivity went up.
Thomas Kantermann tells DW why daylight saving should be abolished.
There's a clock in the spleen," says Barbara Helm, a chronobiologist
at the University of Glasgow in Scotland.
Our surveys suggest that in Western societies two thirds of the population are burdened with a significant discrepancy between their internal time and the demands imposed by school and work schedules and leisure stress," said LMU chronobiologist
Professor Till Roenneberg, who coined the term "social jetlag" to describe the phenomenon.
Sleep is controlled by your internal body clock and also by your sleep homeostat, which is like an egg timer you flip over in the morning, allowing sleepiness to build up gradually through the day," says chronobiologist
Dr Victoria Revell.
In a separate special session, Debra Skene, a Chronobiologist
from the University of Surrey, referred to the association between "light at night" and cancer as "possible, though unproven".
Dr Victoria Revell, a chronobiologist
at the University of Surrey, said: "Light is critical for synchronising our internal body clock, that drives daily rhythms in our behaviour.
It wasn't until 1999 that Harvard chronobiologist
Charles Czeisler advanced beyond the approximate and accurately measured the day at 24 hours and 11 minutes.
Because of the effect on melatonin production and the link to breast cancer, Abraham Haim, a University of Haifa chronobiologist
who took part in this study, questions the safety of banning conventional incandescent light bulbs and moving to fluorescent bulbs to save energy.
Ekirch quotes a chronobiologist
as saying, "Every time we turn on a light we are inadvertently taking a drug that affects how we will sleep.