Okay- here's my thinking in as logical a form as I can manage tonight

First- absolutely I agree that ANY time in the care of other adults should be:
adults the parents know well
adults the parents feel comfortable with
a reasonably safe environment
a situation that parents AND child feel comfortable with (if it seems off- listen to that voice)
That said, the only way to promise total safety of our children is to wrap them in bubble wrap and keep them in the closet. That does not teach them anything.
One of my biggest tasks of parenthood is to provide my child with a variety of experiences that will nurture them and help them grow into strong and stable adults.
Spending time *outside* our family unit is a big part of providing those experiences.
Of course this must be done in a method appropriate for the age and maturity of the child. My dd is nearly 3.5 and has never spent the night away from me. She is not ready.
Now, in a "school age" child, spending the night with close friends provides an excellent opportunity to learn about the way others live. Hey, some people take showers in the morning instead of at night! Different people have different bed-time rituals. In some families DAD cooks breakfast! Whatever. There ARE differences. And yes, some can be learned during the day, some however are really only experienced when sleeping away from home.
That said, there is also something to be said for the experience of childhood. Staying up all night and _fill in the blank_ (playing video games, watching movies, doing makeup, telling stories, playing dolls, whatever)
This can be -in and of itself- a valuable experience.
If there is a *specific* reason you don't feel comfortable with a *specific* situation, I feel that we owe it to our children to explain how we come to that decision. Then they get to see the thinking behind our decision making. Whether it's clear-cut (Sammy's parents don't have the same safety rules we do) or more nebulous (I don't feel like we know Jane's family well enough to do that yet) they will learn to discern the signs for themselves. What do they learn if it's just forbidden?
-Angela
Follow Mothering