My son is on the spectrum, severe sleep apnea, severe crohns, and svt. Now we are unable to allow sleepovers because of his medical needs have progressed. Health wise he is unable to be away from me. However in the past he stayed with his aunt. I know that doesnt really count. However he never made it past 10pm before I was needing to pick him up. Maybe if you decide you can do it on a day where you can pick up early, or be prepared to pick him up late that night. Sorry I do not have better advice

I would make sure and talk to the mom prior not with son around. I have learned that sometimes a new place he may do well without any restrictions.