Sleep Problems More Likely Soon After Epilepsy Diagnosis

What was studied

Researchers used a nationwide Korean health insurance database from 2002 to 2013 to study whether people with newly diagnosed epilepsy were more likely to later be diagnosed with a sleep disorder. They followed 2,414 people with epilepsy and compared them with 24,140 people of the same age and sex who did not have epilepsy. Everyone in the study started without a recorded sleep disorder.

The study tracked new diagnoses of sleep disorders over up to 10 years. The researchers also examined whether risk changed over time and whether it differed by age, sex, and smoking history.

What they found

People with epilepsy were diagnosed with sleep disorders more often than matched controls. Over follow-up, 15.0% of people with epilepsy developed a sleep disorder compared with 8.1% of controls. Overall, the incidence rate was about twice as high in the epilepsy group.

The risk was highest in the first 2 years after epilepsy was diagnosed, then declined over time. Higher risk was also reported in people younger than 60, in men, and in former smokers.

Limits of the evidence

This was an observational study based on insurance records, so it can show an association but cannot prove that epilepsy caused the sleep disorders. Diagnoses were identified by billing codes, which can miss cases or misclassify them.

The abstract does not say which specific sleep disorders were most common, how severe they were, or how epilepsy medicines may have affected risk. The study was done in one national population in Korea, so results may not be exactly the same in other countries or healthcare systems.

For families and caregivers

This study suggests that sleep problems may be more common after an epilepsy diagnosis, especially early on. For families, that may be a reminder to pay attention to sleep symptoms, since sleep is important for quality of life and the abstract notes that sleep disturbances can adversely affect seizure control.

The results do not mean every person with epilepsy will develop a sleep disorder. But they support asking about sleep during follow-up visits, especially in the first couple of years after diagnosis.

What to watch next

Future studies that include medication profiles and more diverse populations, as well as details about specific sleep disorders, may help clarify these associations. Families can ask a clinician when sleep screening is appropriate.

Terms in this summary

cohort study

A study that follows groups of people over time to see what health outcomes happen.

incidence

The number of new cases of a condition that develop during a certain time period.

hazard ratio

A measure comparing how often an outcome happens in one group versus another over time.

observational study

A study where researchers observe what happens without assigning treatments or exposures.