I'll keep it brief as I can
For info I am ND as is my son in this scenario (Autism) I mention this as some may see it as relevant (also ND 13yr daughter in property)
Son has had a friend since starting primary, we will use initial R, obviously at primary much closer but drifted slightly (due to covid and general growing up) through high school, since son turned 18 in Sept son has started to enjoy going out with friends, sometimes having a drink but on a couple of occasions has come home as party has not felt right or just didn't enjoy, (I left home at 15 so never did the teenage years)
R has been present at parties, has been to my house, I generally make them burgers before they go out (line the stomach), allow his friends I know well to stay etc and try to be respectful of sons age, decisions etc
Now Xmas eve at 2045 I was in bed, son asleep, R knocks on door, I went down and he asked for son to come to door, I advised son sleeping, checked R ok and if he needed anything but declined and walked away
Last night at 2350 persistent knocking, tbh I went downstairs already panicking thinking someone was seriously hurt/died ( I do catastrophise due to ASD and PTSD) R at door, clearly worse for wear, with an unknown male stood a bit further back, asked for son to come to door, I went to son who declined and asked me to tell him to leave, which I did, upon going back upstairs to son, he was clearly agitated, he stated R has taken to smoking weed, drinking excessively and lifestyle choices he is not comfortable, he considers friendship with R non existent at present, has communicated this in a simple but clear message which I have seen ( son dad functioning alcoholic who he is NC with so son does struggle with those who make such choices )
I reassured son I am not annoyed with him etc and will support his choices, went to bed but then didn't sleep thinking about situation
I'm not sure what I'm asking really, I'm just worrying about son and about people knocking on door at what I consider an unacceptable time of night (although I go to bed early as shift worker in NHS so appreciate I may be being unreasonable), now at work worrying as 18 and 13yr old at home while I'm at work, have suggested to 18 not answer door, told 13yr old not to do so (general rule anyway)
Am I helicopter parenting, I know I'm overthinking but I do not know how to proceed if this continues
Sorry it was not brief but cannot stand drip feed