Alice's Eight-Year-Old Daughter Hannah Constantly Argues with Her About Her

Alice's eight-year-old daughter Hannah constantly argues with her about her bedtime. Hannah wants to stay up until eleven o'clock at night, which means she might get about seven hours of sleep. What would her doctor say about this bedtime?

A) Hannah needs to get about 10 hours of sleep.
B) Seven hours of sleep would be more than enough.
C) Hannah should be in bed by eight o'clock if she needs to get up by eight the next morning.
D) As long as Hannah gets at least eight hours of sleep, staying up is okay.