DD's bedtime is 9.00pm with lights out at 9.30.
I'm starting to think it might be time to let her go to bed a bit later. (eg 9.30 with lights out at 10.00?), although as a single parent, this will cut into my peace and quiet, not being talked at time.
What time is bedtime for your 14 year olds? (She's an August birthday year 10).
I always have to wake her up for school, if that's relevant.