First sleepover didn't work out

This is an update. I've posted on here about our foster son(now legally adopted son) and the last post was about him getting invited to a sleepover. His first real sleepover. He's 16 but has a lot of trauma from abusive(physical, emotional and sexual). He has accidents at night and wears goodnites. Me and my husband want him to be able to live like a normal teenager. He's finally making friends. I let the mom know about his issue. Packed him goodnites in his sleep bag and made sure he knew he could call us of need be. In the middle of the night I got a phone call from the mom saying he seemed to be having a panic attack and wanted to come home. He came home and one if Hus friends came with. Nothing bad happened with the boys. He just had a nightmare and wanted us and weren't there. His friend told him he hopes they can try again at a sleepover next time. This first sleepover may have been a fail but he seems to have good understanding friends. Hopefully with time he will be more okay sleeping away from home without us.