It was only a matter of time before experts would tell us that eight hours of sleep a night could be too much. And they have.

Occasionally hitting the snooze button on the weekend is not cause for alert. But repeatedly sleeping too much can in fact be a sign that there may be an underlying medical problem. Experts say that very few people can actually sleep more than they need. So if you are, it may be time for a check-up.

A new study had researchers following 10,000 people between the ages of 42 and 91 for almost 10 years. Their focus was not only on how much sleep they got each night, but on whether or not they had a stroke, according to TIME.

On average, seven out of 10 people slept between six and eight hours each night. One in 10 slept more than eight hours a night on average. The people who slept more had a 46% higher than usual risk of stroke. This risk was about double of that of people who reported getting a standard amount of sleep each night.

In the past, sleep deprivation has been linked to a greater risk of stroke. So it was surprising to find that the study suggested the opposite. The researchers said that the study only drew an association between the two, but they speculated that long nights of sleep may be linked to increased inflammation, which can eventually lead to cardiovascular problems.

The experts say that as long as sleeping too much is not a habit, there is no room for concern. At this time they are in the process of testing prolonged sleep for its utility in clinical practice. For now, the researchers of the new study say their conclusions need additional investigation, and priority should be given to understanding the underlying mechanisms.