I think dd who's in Yr7 should be in her room quietly from 9 (reading or TV) to be asleep by 10.
She acts like this is totally unreasonable and runs around the house bags or on calls with friends until at least 10.
She gets up at 7.15 for school and is a bit of a duracel bunny type but does often say she's tired and is pretty grumpy.
Shall I get harder on bedtime or is that unreasonably early? What time are your dc in bed?