K.P.
C.,
When my oldest daughter brought up the ideas as a pre-schooler (then age 4), our response was that she needed to have four (the number was one she identified with as her age) sleep overs at Grandma's house (without mom or dad) before she could go to a friend's house.
It worked because she was in a place that she had been before, but it still took three tries before she didn't cave in and cry to come home. She is now age 6 and has successfully spent the night away from home a few times.
I would feel terrible allowing her to stay at anyone else's house before she really was ready for the sleep over experience.
My sister struggles with a neighbor girl (age 7) who has twice "failed" in the middle of the night during a sleep over. My sister said that the little friend just doesn't understand that a sleep over is for ALL NIGHT (in spite of assurances that she does). My neice (who is 7) is hurt when her friend leaves and everyone just tries to pick up the pieces.
Your article will be appreciated by a lot of moms and dads who are helping their children (and friends) gain this level of independence.