@drizzzle
Well, no, because a child using a unicycle, unlike a phone, would probably keep me and other family members not involved in the sleepover, awake all night.
Also a unicycle, unlike a phone, could, if used unsupervised, cause serious physical damage to my home.
Also a unicycle cannot be used as assistance in an emergency situation.
To save you trying to think of another utterly fatuous example, if your child brought a nintendo DS, or some high-sugar haribos, or an aged 15 dvd when they are only 13, or another example of something I wouldn't think was ideal for children to have all night but which wans't illegal and would have no extreme adverse effects to themselves, other children, or my house for a sleepover then yes, I would of course let them keep them.
You are right, by the way, according to the Cambridge Dictionary OP can't confiscate the children's phones, but only because she doesn't have the right to do so:
confiscate: to take a possession away from someone when you have the right to do so, usually as a punishment and often for a limited period, after which it is returned to the owner
So if OP doesn't have the authority to be 'confiscating' does that mean she is technically stealing?
Theendofmyrope nobody is saying kids can't manage? I 'could' manage to go 12 hours without eating but if there is food available for me and it will make my day more pleasant to eat, why wouldn't I?
@aliensprig Yes I have been a teenager. I described an incident upthread where, as a teenager, a mobile phone was of direct benefit to me at a sleepover. Whodoyoutrust gave a similar example where a mobile phone would have helped her.
re: 'no 13 year old actually "owns" anything in their possession, their parents do.' As an adult, if you buy something out of your own savings, does it belong to your parents? What if someone gives something to you as a gift? Why does this arbitrary (and entirely legally incorrect) definition of 'possession' and 'ownership' change? Aged 16? 18? 21?