Institute rules around game play—and follow them consistently. “Don’t let yourself fall into these traps, like, ‘Well, he didn’t play last week so we let him play an extra three hours this week,’” said Michael Milham, vice president of research and founding director of the Center for the Developing Brain at the Child Mind Institute.

Some experts advise parents to warn kids about 20 minutes before it’s time to shut down so they know what to expect and don’t begin a new level or mission. Dr. Milham suggests not letting kids play videogames right up until bedtime, because some have trouble settling down to sleep.