If you need another reason to get enough sleep, here it is: It may help your heart health.

The American Heart Association added sleep duration to its cardiovascular health checklist. It's a part of "Life's Essential 8," a questionnaire that measures eight key areas to determine a person's cardiovascular health.

The updated list was published Wednesday in Circulation, AHA's peer-reviewed journal, and replaced the association's "Life's Simple 7" questionnaire, which had been used since 2010.

In addition to sleep, the new list retained the original categories: diet, physical activity, nicotine exposure, body mass index, blood lipids, blood glucose, and blood pressure.

Sleep duration made a list after researchers examined new scientific findings over the past decade that found sleep played an important role in heart health, according to Dr. Eduardo Sanchez, the AHA's chief medical officer for prevention.

"Folks not getting enough sleep have a higher likelihood of things like obesity, hypertension, and diabetes," Sanchez said.

What counts as healthy sleep?

Adults should get seven to nine hours of sleep each night, said pulmonary critical care and sleep specialist Dr. Raj Dasgupta, a clinical associate professor at the University of Southern California's Keck School of Medicine in Los Angeles.

However, people need to have quality sleep to reap the benefits, said Dasgupta, a spokesperson for the American Academy of Sleep Medicine.

A person goes through multiple sleep cycles made up of non-REM and REM (rapid eye movement) sleep, Dasgupta said. There are three stages of non-REM sleep, and in the third one you enter deep sleep, which restores the body both mentally and physically, he explained.

If you keep waking up, it will prevent you from going to those deeper stages, Dasgupta said. This can lead to higher blood pressure and increased blood sugar levels, which are associated with diabetes and obesity, he said. Those conditions contribute to lower heart health and increase the risk of developing heart failure, Dasgupta said.