Sleep deprivation could be dangerous for people with metabolic syndrome, reports CBS.

In order to be diagnosed with metabolic syndrome, Narula said you need to have at least three of these symptoms: “Elevated or enlarged waist circumference, low HDL [‘good’ cholesterol], high triglycerides, high blood pressure and high fasting blood sugar.”

The study also broke new ground by measuring people’s sleep in a laboratory setting, Narula said, versus the more common self-reported sleep studies. It also factored out sleep disorders like sleep apnea, which raises cardiovascular risk, she said.

“In this study they kind of took that out of the equation and really focused on just the duration of the sleep,” Narula said, but she added that it only studied one night per person.