We already know that there's a link between insomnia and depression, but a new study goes further and teaches us something new.
Researchers at the University of Western Australia not only found that men who have trouble falling asleep are at a greater risk of depression (insomnia doubled the risk of depression in older men) but that the link could not be explained by reverse causality.
In other words, the researchers determined that although insomniacs are at a greater risk of depression, there is no evidence that depression causes insomnia.
This is the first time we've heard of such a finding. Hopefully it will pave the way for a better understanding of the link between sleep disorders and depression in the future.
Last updated: September 2, 2011