Dr Jessica Rosenberg of the Institute of Neuroscience and Medicine in Jülich, Germany says: “Our results show that extreme ‘late chronotypes’ (night owls) show differences in the diffusion of water molecules in areas belonging to the white matter of the brain as compared to early and intermediate chronotypes (larks).”
This indicates a difference in the level of signal transmission, or communication between brain areas, she explains.
This could be linked to depression in owls, who suffer a kind of ‘jet lag’ by being forced to reluctantly participate in a world of early risers which is in conflict with their natural tendency to sleep late.
The fact that night-owls show a much larger ‘discrepancy’ than early risers between individual sleep preferences and normal work schedules can lead to what she calls “the accumulation of a substantial sleep deficit during the working week”.
And, as much research has shown, there are links between depression and lack of sleep.
Also, studies carried out at the University of Western Sydney reveal that a night owl is more likely to be narcissistic and more Machiavellian in their desire to manipulate others — and may even be more inclined towards callousness and insensitivity.
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