Bedtime doesn't have to be a battle! Stick to a routine, even on the weekends. It can include a soothing bath, brushing teeth, and going to the bathroom, but it should always end in the bedroom.
Plan an enjoyable wind-down activity before sleep, such as reading by dim light. Make sure your teens are not using screens in the time before bed. Also ensure the bedroom is dark, cool, quiet, and screen-free.
For problem sleepers, reserve the bed for shut-eye only -- no reading, homework, or playing games.