A study by two Barren County High School seniors finds that those who suffer from sleep apnea may want to avoid falling asleep while lying on their backs, reports Glasgow Daily Times.

In their project, “Sleep Positions Effect on Sleep Apnea,” Trulock and Carey concluded that patients who sleep in the supine position, or on their backs, had the most amount of apneas. Trulock defined “apnea” as “a total cessation of breathing.”