TENAFLY - Tenafly School District officials sent a letter to parents warning against what middle school students are calling the “pass out” game.

In the “game,” students make themselves hyperventilate for one to two minutes, causing a state of dizziness. They then stand up and pass out before regaining consciousness, triggering a brief high.

The letter warns that it could cause brain damage, serious injury or death.

The letter asks parents to talk to their children about the dangers of engaging in such behavior. It says the district will contact the parents of students who have apparently participated in the “game.”