Oversleeping might be the activity of choice for college students, but sleeping more than eight hours a day could have significant health risks.

A new study published in the journal Neurology found that people who regularly sleep for longer than eight hours a day are at a higher risk for stroke than people who sleep six to eight hours daily.

The researchers studied almost 10,000 people aged 42 to 81 for nearly 10 years, recording how long they slept each night and if they had any strokes. The participants who slept the most had a risk of stroke 46 percent higher than average, and their stroke risk was double that of those who slept six to eight hours a night.

For now, the study authors note that more research is needed, since the study only proves correlation, not causation, between the two. But the researchers also note that oversleeping may be a sign of other health problems, such as depression, cancer, or neurological deterioration. Meghan DeMaria