I see no harm if children stay up late here especially while on holiday, if you look around you will find that Turkish Children are always up late in the summer. Its cooler for them to sleep later at night, that said you wont see too many Turks drinking too much alcohol while the children are with them Although some do!
I used to take my boys out of school for holidays because my husband worked shifts and had no choice at all of days off, they didnt suffer educatioon wise its only a couple of weeks and mostly it would be May June when near the end of term and the schools werent doing much more than winding down for the end of year with sports days etc,