40 teenagers!!!!! You are either a saint or mad. But pleased to hear they are clearing up.
The first time we went away & left DS (age17) for the weekend I came home & walked in and said: "You've had a party". DS was most puzzled as to how I knew - it was because the house was cleaner than when I'd left it!! He'd only had about a dozen round & they spent hours cleaning up - bless.
I downloaded a meditation podcast at 4 and slept for a few hours Everyone is alive and about to start tackling the mess. DS got up and is playing football ( the restorative powers of the young) I am hiding until they have finished cleaning
We used to do cub camp overnighters on the days we lost an hour. So when they got up at silly o'clock (about 5.30) it was actually 6.30. And we used to haul the parents out of bed to collect them at 9 (originally 8). Every year one parent forgot, and turned up late [evil]