Piggy, the school gives excellent PSE classes; I think DD is talking it all up, to excuse her own behaviour. Of course, a few 17 year olds drink too much on a night out, and a few smoke weed, and a few are sexually active, but DD would have us believe that everyone’s at it, all of the time!
In our day, you’d sneak your way into the pub and hope to get a few rounds in before anyone asked your age. I definitely wasn’t taking vodka in Chilli bottles and drinking it in a local park 
Crazy, that is exactly what DD does. She’ll decide she needs to exercise, go he’ll for leather for a couple of weeks, and then stop and eat biscuits and cake to excess. Or she’ll decide she needs to do more revision, so sets the alarm for 7am, does a couple of days of 6-8 hours a day and then stops altogether.
She has always been like that - when she was younger, she’d keep eating past the point we’d tell her to stop and then throw up. She lives in a state of extremes.
This morning’s drama was that she’d only managed 4 hours sleep and had nothing to wear for school. Cue tears and storming around, slamming doors and shouting.
When she gets home tonight, I might point out that perhaps the bucket of iced coffee she downed just before she went to bed wasn’t the best idea...