Nina’s grades could be better. She gets about five hours of sleep every weeknight and ten hours per night on weekends. How much sleep should she get to better concentrate on schoolwork?

Teens generally need about 8–10 hours of sleep each night to support concentration and learning. Nina gets only about five hours on weeknights, and sleeping longer on weekends does not make up for that shortfall. Nine to ten hours every night is the best choice.

AI-written and checked against the verified answer.