I realise we all parent differently and our teens are also all very different. I have 13 year old, who (I think, for now) is very sensible more so than me at times and quite grown up for his years!
Option A. Allow a teen to self regulate use of the internet at night time (during the school holidays) be it gaming, messaging, face timing and (hopefully) no conflict. With a "keep the noise down" attitude as us oldies slope off to bed knackered!
or
Option B. Enforce a "turn it off at a certain time" be it 10pm/11pm etc rule and have certain conflict together with a stroppy, sulky teen for the school holidays?
....just wondering!!!