Insomnia affects about a third of people living in the United States and approximately 770 million people worldwide.
As many people with insomnia will know, there is a tendency to think that falling asleep is a matter of willpower.
However, more and more studies are showing that it actually has a strong neurobiological component.
For instance, in 2016, scientists found abnormalities in the white matter tracts of people living with insomnia, as well as in parts of their limbic system. More recent studies have uncovered specific genetic variants linked with insomnia risk.
