Primary insomnia disorder in youths is linked to a diminished reward positivity indicating disrupted reward processing, which is independent of mood disorders.
Why this matters
Insomnia and depression are common comorbid conditions in youths. Although disrupted reward processing, as measured by event-related potential, has been linked to depression, it has not been tested in insomnia. This is the first study to investigate reward processing in insomnia disorder using reward positivity in youths. The findings highlight reward-processing alteration as a potential mechanism underlying insomnia; better understanding of the long-term effects of insomnia-related reward dysfunction could help to identify those at risk of developing mood disorders.