My husband and I used a 'Cinderella' rule to limit our kids' screen time. We don't regret it.

• Maria and Dexter Estrada locked their kids' devices at midnight with Google Family Link and Microsoft Family Safety.
• Emphasizing screen time moderation, the Estradas suspended this "Cinderella" rule on weekends.
• Both children excelled, winning $67,000 in science awards and pursuing tech and medical careers.

This as-told-to essay is based on a conversation with Maria Estrada, 51, who is a plant-science lecturer at Fresno State and the mother of two teenagers. It's been edited for length and clarity.