How did it work in BG1&2 ? I never noticed disapearing poeple... Does they all have a house and a bed ? I don't think so but i'm not sure, I never try to follow them...
Wasn't in Taverns, bit others were just de-spawned iirc. Certain missions could only be done at night, certain encounters only happened at night etc...
I can't remember people "sleeping", been a while since I last played though.