Dd has been invited to a couple of sleepovers recently, which we've had to say no to as we've been away/doing other things but even if she'd been able to go I'm not sure it would've been a good idea.
She's 6 and not v reliable at being dry at night - pretty sensitive about it when she does have an accident so if it happened with friends around she'd be mortified I think.
One of the invites was from family friends who we know v well and another from a schoolfriend whose parents we don't know so well. Either way I think I'd be a bit worried that she might not ask for help from the parents in the night if she needed it as she's quite shy, so think it would be better to wait til she's older. Am sure I didn't do sleepovers til much older (but then my folks were pretty strict and I don't want to be!)
Just wondered what other people have done, so I know for next time!