I agree with Somerville some pages back "this thread has gone batshit".
Also a number of posters have been deliberately obstreperous, I'm quite embarrassed on your behalves.
I have had children as young as 4 yo coming to my house for sleepovers. No child needs a phone overnight.
I'm generally considered a fairly strict parent so there are all sorts of rules in our home which some kids don't follow at home including eating at the table with nice table manners, no screens during a meal, no jumping on furniture, no taking food without asking, no violence or bad language to name but a few.
I don't outline any of these to the parents of visiting children. My house, my rules. If your child can't follow the rules they go home.
I've had anxious children come to stay several times. Their parents didn't need to "disclose medical information" they just needed to tell me quietly that wee Jimmy is a bit worried about xy or z and we made appropriate arrangements to reassure Jimmy and make him comfortable in our home, within our rules.
One of these children always needs to speak to his Mum the phone before bedtime. No problem. But the phone didn't stay in the room.
All children who stay with us for the first time are shown our bedroom and explicitly told they can wake us at any time if there's a problem.
I always send a quick text to parents around bedtime giving them an update on their kids and in the morning to say how they slept (or not!).
If you don't trust me to look after your child, don't send them.
If your child doesn't trust me to look after them, don't send them.
If your child can't cope overnight without continual access to a mobile phone, I'm very sorry but they shouldn't be staying.
I'm very sympathetic to the problem of an anxious child and I'm very keen to be a good host and make guests comfortable. But sleepovers are not obligatory. Plenty of children don't go on them.
If your child can't cope overnight that's completely fine. Just wait until they are. Don't put them through the stress, it won't help them.
It's not about being a "perfect" parent. It's about assessing the greatest risk. It's about running my home to my standards.
personally I confiscate Nerf guns 